Verizon 5G issues - Samsung Galaxy S21 Questions

Ok, so I have the SMG991U and almost every time it's in 5G I have no internet: it feels almost as though there is no date.
Tried poking around and I can't find anything but I'm sure I can't be alone. I think I had the issue with 12 (hard to say as I was carrying two phones at the time - one work one personal). Now that I'm down to one phone and this is my primary, it's pretty damn annoying (to say the least).
There are places where 5G is working fine, but most of the places when it's on 5G it's as though I have no coverage. When it rolls into 4G it's flying.
If I could set it to run 4G only that'd be great BUT there is no option for that. Any suggestions?
I'm running Android 13. All current updates. Baseband is G991USQU5DWa8

Try this dialer code and report results.
It lets you disable 5g bands. The app won't work probably, it was messed up before 13 came out, try it out and let us know!
How To LOCK LTE Band Without Root on SAMSUNG Device
This method is specifically for Samsung Galaxy. Because the default hiddennetwork system application is available. for devices with other brands and types, I haven't tried it. Please follow the following methods: 1. You need to install this app...
forum.xda-developers.com
" does *#2263# give you the menu to select bands for each SIM slot?
This is another way to choose LTE bands but a little annoying." .
Btw since you're on u5, you could roll back to the one from May 2021, i used the T-Mobile cvdb version. It lets me use that app to easily switch bands as a few bands are worse than dial up in my area
This is Verizon's cvdb
Download Galaxy S21 5G SM-G991U (VZW) G991USQU5CVDB in Samfw - Samsung firmware download
Galaxy S21 5G SM-G991U (VZW - United States) G991USQU5CVDB S(Android 12) samsung firmware download all model, lastest, fast update, completely free and fast speed in Samfw.com ✅
samfw.com

*#2263# does not work. Regarding rolling back to a different version, Verizon is locked every which way there is. Otherwise I'd be running a custom ROM

r.Huzar said:
*#2263# does not work. Regarding rolling back to a different version, Verizon is locked every which way there is. Otherwise I'd be running a custom ROM
Click to expand...
Click to collapse
You can roll back... The u5 of your current version means you can roll back to that one I linked which is also u5. After doing this,
Also remember to adb disable the update app
( com.wssyncmldm )!
If it were u6, you can't go to a u5 firmware.
I forget what that's called, some kind of revision number. Older ones could be rooted and use custom roms.
How to update to the latest Software via Odin - also for flashing/unbricking any firmware
Hello everyone! I made a tutorial regarding flashing the latest updates, flashing custom ROMs or unbricking your device: Video guide: Steps: 1. Download and extract both Frija and Odin. 2. Launch Frija. 3. Check the "Auto" button. Write your...
forum.xda-developers.com

Related

[Q] Firmware version, modems, etc (301u/302u)

I got myself a MediaPad S7-302u on Tesco Thailand yesterday, and the first thing I did was to update the firmware to the International ICS available on the website. New firmware is great, all is working, I might change to a "modded/tweaked" version here from XDA like I do on my Galaxy S2, former Galaxy S, gf's Galaxy 5, etc...
Little problem... apparently the version on the website is for MediaPad S7-301u. Only difference between them seems to be frequency of the 3G networks. The tablet is working beautifully, GPS, mobile data, etc, EXCEPT for 3G, in the network I use, AIS/1-2-Call. I don't have a big problem in using Edge, I do the same with my S2, to save battery, and I don't care about the reduced speed (Edge here works well, I get usually close to the 384kbps max speed), but I'd like to have the option to, eventually, one day... go to 3G. The problem is that I can't seem to find ANY firmware versions for the 302u!
Any idea where those are hiding? Tks!
Install huawei mediapad Russian version which was released on 30th May, it solved my 3G issue with my network.
Sent from my HUAWEI MediaPad using xda premium
supun said:
Install huawei mediapad Russian version which was released on 30th May, it solved my 3G issue with my network.
Sent from my HUAWEI MediaPad using xda premium
Click to expand...
Click to collapse
Thank you supun, but unfortunately it hasn't changed anything here. Still only on Edge, and no sign of 302u file on Huawei website.
LeoViotti said:
Thank you supun, but unfortunately it hasn't changed anything here. Still only on Edge, and no sign of 302u file on Huawei website.
Click to expand...
Click to collapse
I'm not sure will my post would help u on this matter or not but try no harm,
Try search this rooted OEM version and install into ur Mediapad.
HUAWEI_S7-301u_FIRMWARE_android4.0_C232B002_General_Channel_05010YBX-root.zip
* before insitall this , pls installed unrooted version.
* U also can refer to below post.
[ROM][ICS] [UNOFFICIAL] Root-ready Huawei MediaPad/SpringBoard ICS International ( 1 2 3 ... Last Page)
Originally Posted By: shiranmotha
6th June 2012 01:51 AM
by brickchamp
Interesting. The 303U is the T-Mobile Springboard which is what I have.
I have two SIM cards in Canada with different 3G-only carriers, and a 303U Springboard unlocked from T-Mobile. One carrier uses AWS 3G (same as T-Mobile) and the tablet sees the network but cannot connect to it at all. The other carrier uses 850/1900 3G and the 303U supports 1900 but not 3G, so it does get connectivity with occasional dropouts.
I was never able to connect to the AWS network before the upgrade but I didn't try very hard. After the ICS upgrade I have still been unable to get on the AWS network and I tried in-store with a SIM from another AWS network too, to no avail.
From before the upgrade, I did capture an update.zip that seems to contain modem files for the T-Mobile Springboard, but the last time I tried to flash modem files directly I lost my IMEI and SIM unlock until I did a full reinstall of ICS.
Not sure either about 302U firmwares.
I just read on development forum a 302u ICS firmware has just been released. I might try that one later, it's just quite annoying to lose everything on every flash, specially on stock ROMs, with no root.
Sent from my GT-I9300 using Tapatalk 2
LeoViotti said:
I just read on development forum a 302u ICS firmware has just been released. I might try that one later, it's just quite annoying to lose everything on every flash, specially on stock ROMs, with no root.
Sent from my GT-I9300 using Tapatalk 2
Click to expand...
Click to collapse
You can add root to any ROM. Download the CWM-based recovery from here (note it does NOT do backups properly so you can't rely on that):
http://forum.xda-developers.com/showpost.php?p=23601045&postcount=7
And also place the SuperSU zip from here on the root of your external SD card:
http://forum.xda-developers.com/showthread.php?t=1538053
Flash CWM in fastboot as described, to both recovery and recovery2, and then you may have to try a few times to get into recovery. From a totally off state, hold down the volume "UP" key (which is the one pointing AWAY from the power button) and hold down power until it vibrates. Let go of power and hold on to the volume key. Then in CWM you can find the SuperSU zip on SD and flash it. Now you're rooted and you can take a Titanium Backup.
BUT if you ever want to do an official upgrade now, you will need to revert to a stock recovery. Take the recovery.img from any ICS firmware package and flash that in fastboot to recovery and recovery2. Or if you are every currently on an HC ROM you need to use an HC recovery.
Something else to try... worst case scenario is you'll have to wipe anyway. Download the Huawei firmware zip, extract the dload directory, and then open the update.zip. Delete the userdata.img.ext4 from that zip. Put the modified dload directory on external SD and proceed as usual. If it installs correctly it should (I hope?) leave your data partition alone.
According to member cmstlist below are the different between huawei official releases.
302u is an 850/1900/2100 version
301u is 900/2100. T-Mobile Springboard is 303u
AWS/1900/2100. AT&T's is 312u.
I thinks because of using wrong FW updates some times experienced 3G/HSPA issue.
Should I ?
[QUOTE=supun;28441328]According to member cmstlist below are the different between huawei official releases.
302u is an 850/1900/2100 version
301u is 900/2100. T-Mobile Springboard is 303u
AWS/1900/2100. AT&T's is 312u.
I thinks because of using wrong FW updates some times experienced 3G/HSPA issue.[/QUOTE]
------------------------------------------------------------------------------------
Can I quickly hijack this thread.
I have the 7A-301U. (Orange Tahiti UK) that came with ICS (Andy4). Works perfectly BUT abruptly stops ringing after one second on attempting to reach any 3G Signal Provider. (correct Orange EE sim inserted) . Similarly, if I attempt the simple task of dialing for my own IMEI ..... #06# Question: Should I re-Firmware from the Huawei site.
Ciao,ringrazie salute.
There's a new Mediapad s7 302 firmware on Huawei site (Dec 13). It says network function and official release version. It's still ICS.
312u = 302 ?
rurou said:
There's a new Mediapad s7 302 firmware on Huawei site (Dec 13). It says network function and official release version. It's still ICS.
Click to expand...
Click to collapse
Can I use the official 302 Firmware in my AT&T 312u?

LG v10 korean version-flash or not

Hi to all!
This is my first post here.
Couple days ago i purchased LG v10 (F600L) with 64GB of ROM! This is korean model from network U+.
I live in Croatia so I can't use some features from phone, and it's not the major problem.
I wonder if is possible to flash phone with H960 firmware? Via LGUP app from my PC? Is it problem because my phone has no unlocked bootloader and in some posts on the internet I readed I can brick up my phone.
4G does not work either. Probably only korean version of LTE, not supported in Croatia.
So, if I do firmware upgrade via LGUP, with euro-version, will I get phone with only 32GB, will LTE bands be opened to euro-networks?
I didn't say that I can't upgrade my korean version to Android 6.0, via OTA or LG Bridge. It says Cannot check the latest firmware.
So, guys, to do it or stay out of any attempting?
Thanks and regards from Dubrovnik!
Is it true that noone knows?
Cannot, ne mozes! Just try to read a little more about it.
If you click the link you can see there is support for 4G in Croatia.
https://www.frequencycheck.com/compare-devices/ynatK8/lg-v10-h961n/lg-v10-h962
Pozdraviti iz Thailanda
I can see Croatian operators can offer me LTE 1800mHz only.
So, in suburbs of croatian big cities I have LTE, but only in streets, outside places etc. Whei I enter in some bar or restaurant, LTE wanishes.
I'm on VIPnet Croatia which provides LTE 800/1800. It seems my Korean V10 works only on 1800.
Too bad. Cause, it's good phone. I upgraded recently to Android 6.0 (MM) via link on this forum and it works even better than on 5.1.
On posts on this forum(s) I can see that my device cannot be flashed with another firmware. I've downloaded Turkish version (64GB) but LG UP says Error. It seems I have to root my device, but even than, it's not for sure that all LTE bands will working.
Koreans made the mess by locking with brandings their devices.
@moby77: for what I know, you can't flash a different firmware... a brick is nearly assured.
But you can try this code: 5457#*600# then go to Multi Band Selection and check LTE bands that are available in your Country.
Don't know if that procedure works in your device, but it well worth a try!
moby77 said:
Hi to all!
So, if I do firmware upgrade via LGUP, with euro-version, will I get phone with only 32GB, will LTE bands be opened to euro-networks?
Click to expand...
Click to collapse
I am not sure but most probably flashing wrong firmware will brick the phone. However, one thing I am sure is just flashing the firmware on different version never unlocks the bands of 3G/LTE. These bands cannot be unlocked this way. If F600L does not support a particular band in your country, it will not run LTE no matter what firmware you flash.
F600L is very well locked by Koreans so I san't do anything except flashing new kind of firmware, but one provided from U+ network.
One day I got mad, so I used LG UP, downloaded firmware for Turkish H960, and pressed Start button (it really was pissed off so even I bricked phone, my fault. Totaly insane, but...). After 4% od doing "something" it said Error, cannot flash firmware! (or something like this).
Official os
you have H901-10c official os bcz when i upgred using LGUP my phone is not starting as well as not showing charging sign when i am connect my charger

[ROM][STOCK] Moto X Pure/Style Chinese variant XT1570 5.1.1 LPH23.145-7_7

This is the UNMODIFIED STOCK ROM for the Chinese version of Moto X Pure/Style. Model Number XT1570.
The Chinese variant NEVER moved to Marshmallow. While this ROM is NOT the newest, it is one of later official ROM.
Since entire Google is censored by the Chinese government, this ROM does NOT come with ANY Google applications. Many of the similar function are replaced by (much inferior) Chinese equivalent.
Note that Chinese variant is different from other dual SIM variant in the following way:
1. LTE band is different. This is the only variant I am aware of which support both US/AT&T and China/China Unicom LTE band
2. Chinese variant support Baidu Navigation signal in addition to GPS and GLONASS
Additional hardware detail of Chinese variant is in my other post:
https://forum.xda-developers.com/moto-x-style/help/moto-x-style-chinesevariant-xt1570-t3239240
Download URI Link
https://pan.baidu.com/s/1eSIatzk
Password
uwbj
Notice that by default, the batch file WILL flash stock recovery files. be warned!
Is there any chance of flashing it into a XT1572 firmware and be able to use the other bands? I'm new at this and I'm not sure if is it possible
YisusDeSalta said:
Is there any chance of flashing it into a XT1572 firmware and be able to use the other bands? I'm new at this and I'm not sure if is it possible
Click to expand...
Click to collapse
people in China tried and it was very messy. radio no longer worked property. I advice you against it.
I have flashed Lineage OS CM13. both sim card works. BUT I am not in China at the moment, and China uses a different frequency. So, I can't guarantee if it works or not.
YisusDeSalta said:
Is there any chance of flashing it into a XT1572 firmware and be able to use the other bands? I'm new at this and I'm not sure if is it possible
Click to expand...
Click to collapse
Do it at your own risk.. there are possiblties that
1) 2nd SIM won't work
2)you will end up in bootloop
3)while flashing you might get pre valid fail errors
4) it might get installed but you will get lots of FCS
5) everything will be Chinese so you won't understand anything
Do it at your own risk..
Advice to take backup of your rom via twrp and then proceed (at your own risk)
Sagar_1401 said:
Do it at your own risk.. there are possiblties that
1) 2nd SIM won't work
2)you will end up in bootloop
3)while flashing you might get pre valid fail errors
4) it might get installed but you will get lots of FCS
5) everything will be Chinese so you won't understand anything
Do it at your own risk..
Advice to take backup of your rom via twrp and then proceed (at your own risk)
Click to expand...
Click to collapse
Chinese version of x style is being sold in Iran due to sanctions of American manufacturer. our service center flashes xt1572 retasia ds 6.0.1 official ROM and it works fine in IRAN, Chinese network may vary. they also tried flashing retasia and retla DS 7.0 on xt1570 but sim won't work.
i'm gonna try it myself.
kngharv said:
people in China tried and it was very messy. radio no longer worked property. I advice you against it.
I have flashed Lineage OS CM13. both sim card works. BUT I am not in China at the moment, and China uses a different frequency. So, I can't guarantee if it works or not.
Click to expand...
Click to collapse
Hi, can you share the link for "OS CM13" for download for XT1570, i want to try it.
I am currently on 5.1.1 stock ROM, i need clarification on two things
1. My google maps only works when i try to find something but when i ask for assistance it looses GPS signals while i move. I had tried different location & networks but situation remains the same. So any similar issues or should i change to some other Navigation App. My location is Pakistan.
2. Battery timings with 4G LTE, i am getting approx 8-10 hours. Tried replacing it with new but same results.
Hope to hear from you soon.

Question AT&T Base Firmware needed for A526U

Hello, looking for some help to see if anyone can help me find the firmware of my A526U specifically for AT&T? I have moved my phone over from TMobile where I purchased it from, and am looking to re-flash it to AT&T. Was working fine for a few months, now I'm no longer able to make or receive calls.
After inserting the new AT&T SIM card, the TMobile splash screen still shows up. The Service Provider software version reflects TMobile still as well and I'm concerned that for whatever reason the phone did not fully update after inserting the new SIM. I spent 2 hours on the phone with AT&T support after the store said they couldn't help me. Pulled the SIM card out, restarted phone, put it back in, reset network settings etc. I've searched sammobile and I cannot find the AT&T firmware, only TMobile, Sprint, and TMK. I would sincerely be greateful please if anyone could help me by pointing me in the right direction for the firmware for this model phone.
AT&T doesn't make their firmware available publicly - for any device. I have a source who can get me Samsung firmware for any USA device - even AT&T. But he charges me for each one
I appreciate the quick response! Is there any option I have here? Could I try flashing a "U1" firmware to his phone then? He's currently on A526USQS4CVA6. I actually found your other post as I was also working on my note 10 plus - https://forum.xda-developers.com/t/n975u-and-n975u1-firmware-links-here.3957648/. If I'm reading that correctly, I should be able to correct? If so, how can I tell if the version I'm downloading is "downgrading the bootloader"
aschaffer35 said:
I appreciate the quick response! Is there any option I have here? Could I try flashing a "U1" firmware to his phone then? He's currently on A526USQS4CVA6. I actually found your other post as I was also working on my note 10 plus - https://forum.xda-developers.com/t/n975u-and-n975u1-firmware-links-here.3957648/. If I'm reading that correctly, I should be able to correct? If so, how can I tell if the version I'm downloading is "downgrading the bootloader"
Click to expand...
Click to collapse
1. Yes, you can try flashing U1 if you want
2. You can't "downgrade the bootloader" - Odin won't let you.
3. In A526USQS4CVA6, "4" is the position of the bootloader level/revision/binary. Make sure that whatever U1 firmware you download also has a 4 in that spot and you'll be fine. (Or just get the firmware from Frija or one of the other similar firmware download tools, because those throw you whatever the newest version is automatically)
iBowToAndroid said:
1. Yes, you can try flashing U1 if you want
2. You can't "downgrade the bootloader" - Odin won't let you.
3. In A526USQS4CVA6, "4" is the position of the bootloader level/revision/binary. Make sure that whatever U1 firmware you download also has a 4 in that spot and you'll be fine. (Or just get the firmware from Frija or one of the other similar firmware download tools, because those throw you whatever the newest version is automatically)
Click to expand...
Click to collapse
Thank you very much sir! I shall give this a go this weekend! You guys rock!
My AT&T N10+ N975U is running on Pie. It transitioned seamlessly with no changes made on my end. It was already using 4G VoLTE though. Same sim card.
I would contact AT&T advanced tech support as there may be an easier way.
4G VoLTE needs to be enabled in hidden settings.
blackhawk said:
My AT&T N10+ N975U is running on Pie. It transitioned seamlessly with no changes made on my end. It was already using 4G VoLTE though. Same sim card.
I would contact AT&T advanced tech support as there may be an easier way.
4G VoLTE needs to be enabled in hidden settings.
Click to expand...
Click to collapse
Your AT&T phone? So it's originally an AT&T model that you're still using with them? That's not the same situation that the OP is in
iBowToAndroid said:
Your AT&T phone? So it's originally an AT&T model that you're still using with them? That's not the same situation that the OP is in
Click to expand...
Click to collapse
The U is the AT&T variant vs the U1 which is the unlocked variant, correct?
blackhawk said:
The U is the AT&T variant vs the U1 which is the unlocked variant, correct?
Click to expand...
Click to collapse
Yup. But OP has a T-Mobile model that they moved to AT&T. There's also no guarantee that a Note 10+ will work the exact same way as an A52. You're also running 3 year old firmware, while OP is fully updated.
So i don't see the correlation.
iBowToAndroid said:
Yup. But OP has a T-Mobile model that they moved to AT&T. There's also no guarantee that a Note 10+ will work the exact same way as an A52. You're also running 3 year old firmware, while OP is fully updated.
So i don't see the correlation.
Click to expand...
Click to collapse
The old firmware works fine on 4G VoLTE... that's likely not the issue. What is the issue is it wasn't running on 4G VoLTE so it's likely the settings and sim card need updating not the firmware.
Hi All, thought I would provide an update... After spending hours on the phone with AT&T support this week and being frustrated with the AT&T store, I decided to proceed forward with flashing the U1 version. What started this all was last week my son could no longer make or receive calls on his AT&T A52 phone (we ported it from TMobile September 2021). The store and AT&T advanced tech support said there were issues with people's BYOD devices, even though the A526U and A526U1 shows on the supported devices list. The store rep said he's been getting people in left and right that can't make or receive calls, and all they can do is upsell customers to an AT&T branded phone.
SO... my son's phone was on A526USQS4CVA6. Startup screen showed TMobile still, even with the AT&T SIM card in it. I proceed to flash the A526U1OYM4CVB2_ATT that I found from Sammobile. Was hoping someone had just the "U" version but I couldn't find this anywhere. When doing the flash, I used the Home_CSC file (I had to download a patched version of ODIN as it was stuck as setting up connection) and when it finished it would just keep going back to the download screen on the phone and I freaked out. I did some more research and decided to flash again using CSC instead of Home.CSC (I did a backup using smart switch on my PC luckily). This WORKED! I'm guessing because the software version he was on was different than what I was trying to flash too so maybe this is why I needed the CSC for a clean flash (there was no user data file that downloaded from SAMMOBILE).
Now, calls are working on my son's phone again! AND his service provider software version now reflects ATT vs TMB! Man this has been one heck of a journey lol. I've seen numerous forums on google of people having the same trouble with me, their BYOD devices not working. Seems a flash of U1 worked for me, so hopefully this helps others out there!

AT&T S21 SM-G991U unlocked and switched to Verizon, not getting Android 13 update.

Hi,
I have an AT&T S21 5G that I unlocked and now use on Verizon. It works fine but it's stuck on an older version of Android 12. When I check for updates in settings it doesn't show as having any, yet I've read Android 13 was pushed to Verizon already.
Is it because I switched carriers that it wont show any updates? Do I have an option to push Samsung OEM Android 13 to my S21 without losing all my stuff? Am I just stuck with what I have?
I'm just looking for options and some options.
Thank you for your help
Kc0r8y said:
Hi,
I have an AT&T S21 5G that I unlocked and now use on Verizon. It works fine but it's stuck on an older version of Android 12. When I check for updates in settings it doesn't show as having any, yet I've read Android 13 was pushed to Verizon already.
Is it because I switched carriers that it wont show any updates? Do I have an option to push Samsung OEM Android 13 to my S21 without losing all my stuff? Am I just stuck with what I have?
I'm just looking for options and some options.
Thank you for your help
Click to expand...
Click to collapse
Download the latest U/U1 firmware from SamMobile/ Frija and flash with Odin. Make sure you flash HOME_CSC, not CSC as that will wipe data.
Ok, so when I look up the model on SamMobile it only shows up to Android 12, so maybe 13 isn't available for it yet? My software version is AT&T, I wonder if I should push it over to the Verizon latest update even though it's not 13.
Download Samsung Galaxy S21 SM-G991U VZW USA (Verizon) firmware
All Samsung firmwares for Galaxy S21 in USA (Verizon) with model code SM-G991U. We offer free and fast download options. Check them out now.
www.sammobile.com
Thank you.

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