Help finding correct firmware and installing for AT&T SM-G991U. - Samsung Galaxy S21 Questions

Hello all...I'm a fellow victim of the OTA updates screwing us debloaters currently stuck in a boot-loop. I'm trying to recover my the past several years text notes containing all the medical details for my son's illness. Details on that can be found on my earlier post.
As a last ditch effort, I'm going to try flashing the factory firmware in hopes that I'll be able to snag them and then flash the latest firmware. My device is not rooted.
However, it's been many many years since I've done this and I've spent the day reading everything I could to ensure I don't screw this up and I have a few questions. The phone is under warranty and I really don't want to trip Knox.
First...I'm having trouble finding the correct firmware (I think? Yay AT&T!). Unfortunately, since I'm boot looping, I can't load the app to pull all the phone details now. But, when I pulled the phone details a little over a week ago trying to solve another issue, I made a note of what appears to be the baseband version: G991USQU5CVCC.
The only info I can find on it on AT&T's website, here: https://www.att.com/device-support/article/wireless/KM1428542/Samsung/SamsungSMG998U
I'm unable to find a download for it though. AT&T isn't available via Frija or Samloader.
However, if all my ADD-riddled reading today is correct, I should be able to get away with flashing one for the 1U1 version, right?
If not, anyone know where I can find the firmware that would work for the 1U version/G991USQU5CVCC?
If so, my thoughts are that my best chance of being able to it to stop looping long enough would be to flash the last-known-good version as opposed to the latest...this is doable, right? If that's correct, this is the one I've grabbed: https://www.sammobile.com/samsung/galaxy-s21/firmware/SM-G991U1/ATT/download/G991U1UEU5CVGB/1666245/
Also, regarding flashing...I'm reading it can be done via ADB sideload or cracked Odin...is one better/safer than the other?
Any other thoughts or advice would be greatly appreciated too.
Thanks!

Hmmmm....so I just noticed in Android Recovery, it posts a build number. I'm showing RP1A.200720.012, which appears to be for the S20?!
The full build number is RP1A.200720.012.G991USQU5CVCC...which, apparently doesn't exist in Google.

Samsung Firmware Download - Lastest official firmware update
Samsung Firmware Download ⭐ Official and fast update ⭐ Lastest and old version ⭐ Max speed and free download ⭐ Best Samsung Galaxy website
samfw.com
try finding firmware for your device here.
Be careful because you must select Bit/SW REV same as one on your phone, you can't downgrade it.
If you have latest firmware (A12) then your Bit/SW REV is 5

RiBBiTeDD said:
Hmmmm....so I just noticed in Android Recovery, it posts a build number. I'm showing RP1A.200720.012, which appears to be for the S20?!
The full build number is RP1A.200720.012.G991USQU5CVCC...which, apparently doesn't exist in Google.
Click to expand...
Click to collapse
It's not S20, it's S21. If you are not sure, you can even search firmware with your IMEI or SN on post above this

nocio said:
It's not S20, it's S21. If you are not sure, you can even search firmware with your IMEI or SN on post above this
Click to expand...
Click to collapse
Yup, I just had to figure out how it all worked...I was super-worried because I couldn't find 1U firmware for AT&T.
Buuut, guess what?!?!
Holy crap!! I got in!!!
I downloaded a newer version after flashing the current one didn't resolve it...just because...why not at this point?
It flashed successfully, did the same thing after initial reboot through...starts loading lock screen, flashing on/off randomly and reboot.
This time, however, it loaded into something different than the standard recovery menu. I don't remember the name, but, there was only 4 options.
Try Again
Delete App Data
View Logs
Shut Down
I decided to try the Delete App Data option as the data I was trying to get was in the download folder...not specifically part of an app...and it rebooted into Safe Mode without the glitch!! Previously, the glitch still happened in Safe Mode.
It went into what appeared to be a factory reset phone with the Get Started thing, connect to WiFi, permissions, restore data, etc. I skipped all that though, figuring it actually factory reset the phone and that I had officially lost this battle and would have to rebuild all my notes (something I had come to accept would probably be the case in this situation).
But! Once I went through that and got the main Safe Mode screen, I connected it back up to the laptop and EVERYTHING IS THERE!!!!!
I'm copying off now as I type this.
Thanks to you and iBowToAndroid for all your help with this...you guys saved me days/weeks of time to pull all the records and recreate my notes. Unsure how to tag iBowToAndroid on here...but, he helped me understanding the firmware/carrier stuff via DM.

@RiBBiTeDD I have moved this thread out of the Galaxy S21 ROMs, Kernels, and Other Development section. Please be aware that only development content is permitted in development sections, per the Rules for Posting in Development.
Additionally, I would like to remind you of XDA Rule 15:
15. Keep threads / posts on-topic
Whilst a minor amount of off-topic posting may be overlooked, the general rule is that your posts / threads must be relevant to the Forum / thread in which you are posting.
General Forums - For news and announcements relating to your device.
Q&A Help & Troubleshooting Forums - For all question / request threads and posts. If there is no Q&A Help & Troubleshooting forum, use the General Forum of the relevant device
Accessories Forum - For posts related to accessories relevant to the device
Development Forums (ones with the word development in the title) - For Developers to post release threads e.g. ROMs and Kernels including modifications to kernels, bootloaders, ROMs, etc., as well as R&D development discussion threads designed with an end goal
Themes and Apps Forums - For the posting of Themes and / or Apps as well as announcements & discussions including modifications made to Themes and Apps.
Click to expand...
Click to collapse
Thank you.

Related

[Q] ROM solution to WiFi issue?

Hi folks
As mentioned in a thread I posted a couple of weeks back (http://forum.xda-developers.com/showthread.php?t=1207476), Samsung have very annoyingly blocked WiFi channels 12 & 13 on US-originated Tab 10.1s with their latest TouchWiz UX update.
I've got a Tab that I had been using quite happily on chan 13 (minimal interference from neighbouring WiFi APs), but after the updated it wouldn't connect at all, yet could see other networks. Moving the AP channel down <12 solved it, but this only works for my home AP that I have control over. The one at work is on either 12 or 13 and therefore now isn't visible.
The guys at PC Pro have tried their UK-purchased Tab 10.1 and it's working fine, so it seems to be just with the US ones that Samsung have blocked this.
I've logged a support request about it but don't hold out any great hope of them fixing it.
I was therefore wondering if anyone could think of a good way to re-enable this. Do the Tabs had a modem/radio type bin that could be flashed along the lines of the SGS II? If so would this do the trick or are chans 12/13 being blocked elsewhere?
Thanks for any suggestions - as you can see at http://forum.xda-developers.com/showthread.php?t=1223978 I'm not the only one who has run into this problem!
(PS - have already tried a full factory reset before anyone suggests it )
What about flashing a Euro rom, would that then enable the extra channels?
That's the kind of thing I was wondering about, but wasn't sure if it would work or not.
My model number is GT-P7510UWYB and it's 16GB WiFi only model.
Do you think it would just be a case of getting hold of the stock August update for a UK device (and if so, any links? ) and installing it via Download mode/Odin or would it object to that saying it's not a valid ROM for that model?
I don't know I.f there's a newer rom than those shown on the samfirmware site, someone with more knowledge than me may point you in the right direction.
http://www.samfirmware.com/WEBPROTECT-p7510.htm
Questions or Problems Should Not Be Posted in the Development Forum
Please Post in the Correct Forums and Read THIS
Moving to Q&A

[Q] Questions about modem update and a few other things

First, please forgive me if this is the wrong place, but this is the General Forum, and the forum software has changed a lot since when I was really active here as an active phone modder and active poster!
So like I said I've been away from the forums for a long time... trying to rereading a lot and trying to get back into MY PHONE.
I hate my modem sometimes because T-Mobile just sucks in some areas and is great in others [Greater Houston Texas Area, but mostly south side and towards the Galveston Bay].
I would like to know if the newer modems are interchangeable with the below config on my G900T?
And if there is any advantage to upgrading my modem? Wondering what modem I might be able to upgrade to with that below config and if there would be any advancements/pluses/gotmeinabadways/or other things I should be aware of if I did?
Also I'm wanting to upgrade to Marshmellow maybe, should I or should I just forget it? I will be reading more about the ROMs available. I've read a lot of posts about how buggy 5.1.x is. So I don't want to even go there...
Basic Phone info, Stock T-Mobile ROM [Damn bloatware] rooted awhile back with I think towelroot. I would really like to change to a slicker ROM that is debloated and maybe deoxed maybe. Will have to read hella lot more about that for sure..
Model SM-G900T Rooted
edit: Nova launcher
Android 5 not 5.1.x
BaseBand G900TUVU1D0B1
Kernel 3.4.0
TWRP 2.8.6.0 recovery installed
Broken Xposed :crying::crying::crying:
Can anyone recommend an app that will give modem info without having to decipher the baseband? or is there a very good break down of what each part of baseband means? I know go search!!! and I'm trying to reacquaint myself with the forums but the newer software is far different than I remember EKK! And search always hated me!! And even the different forum headers have changed due to time marching on and me being well Techtarded the last year or more due to things better left unsaid...
Have Xposed installed as noted above, but its been f00ked for a long time due to the ARM processor if I remember correctly and the Framework installer not being compatible..... Wish I could used the Xposed but........ I originally got into Xposed due to the Hex icons I actually paid for Xposed because I liked and used some of the modules made by smart people. Again but!!!
daspazz said:
First, please forgive me if this is the wrong place, but this is the General Forum, and the forum software has changed a lot since when I was really active here as an active phone modder and active poster!
So like I said I've been away from the forums for a long time... trying to rereading a lot and trying to get back into MY PHONE.
I hate my modem sometimes because T-Mobile just sucks in some areas and is great in others [Greater Houston Texas Area, but mostly south side and towards the Galveston Bay].
I would like to know if the newer modems are interchangeable with the below config on my G900T?
And if there is any advantage to upgrading my modem? Wondering what modem I might be able to upgrade to with that below config and if there would be any advancements/pluses/gotmeinabadways/or other things I should be aware of if I did?
Also I'm wanting to upgrade to Marshmellow maybe, should I or should I just forget it? I will be reading more about the ROMs available. I've read a lot of posts about how buggy 5.1.x is. So I don't want to even go there...
Basic Phone info, Stock T-Mobile ROM [Damn bloatware] rooted awhile back with I think towelroot. I would really like to change to a slicker ROM that is debloated and maybe deoxed maybe. Will have to read hella lot more about that for sure..
Model SM-G900T Rooted
edit: Nova launcher
Android 5 not 5.1.x
BaseBand G900TUVU1D0B1
Kernel 3.4.0
TWRP 2.8.6.0 recovery installed
Broken Xposed :crying::crying::crying:
Can anyone recommend an app that will give modem info without having to decipher the baseband? or is there a very good break down of what each part of baseband means? I know go search!!! and I'm trying to reacquaint myself with the forums but the newer software is far different than I remember EKK! And search always hated me!! And even the different forum headers have changed due to time marching on and me being well Techtarded the last year or more due to things better left unsaid...
Have Xposed installed as noted above, but its been f00ked for a long time due to the ARM processor if I remember correctly and the Framework installer not being compatible..... Wish I could used the Xposed but........ I originally got into Xposed due to the Hex icons I actually paid for Xposed because I liked and used some of the modules made by smart people. Again but!!!
Click to expand...
Click to collapse
The most recent firmware and modem for the TMo S5 is version OL1,that came out in late December.
muniz_ri has been nice enough to put together a ROM that is the Stock ROM, already rooted, and ready to go:
http://forum.xda-developers.com/tmo...t/how-to-update-to-g900tof6-5-1-1-pc-t3141404
There are links there to the ROM, including the modem, or just the modem files themselves.
Rob
@daspazz the following website has decent basic info that seems to address the questions you ask: http://androidmodguide.blogspot.de/p/other.html
TLDR: yes modems are interchangeable
As for Marshmallow, I'm pretty sure for now, since there has been no official 6.0 update yet, you'll have to go with Cyanogenmod 13 (or one of the variants like Bliss 6.0 or Resurrection-Remix), they're in the unified development section (our phone's development codename is KLTE).
As for deciphering the baseband, look at the last three characters, let's assign them generic letters XYZ. X is the year (M being 2013, N being 2014, O being 2015, P being 2016, etc.), Y is the month (substitute the actual letter for its position in the alphabet), and Z is the revision number. So taking the most recent firmware (G900TUVS1FOL1) as an example: OL1: O means 2015, L means December, and 1 means 1st revision. Another example, build number G900TUVU1ANE6: NE6: N means 2014, E means May, and 6 means 6th revision.
It seems to me there's been some consensus that the most recent modem (which rlichtefeld linked to in the post above mine) is the best
Much Thanks!!!!
@rlichtefeld and @thisisapoorusernamechoice
I really appreciate the information gentlemen!!!! I've been reading through the info you both provided.
I did flashed my modem (only) to the newest one, G900T_OG6_Stock_Modem.tar. Ended up having to flash back to the modem for 5.0, G900TUVU1DOB1-MODEM.tar, because I literally could not hear anyone when I made or received calls.....
Also had to used Odin v3.09, because v3.10.6 wouldn't recognize my phone. Strange that!!
This ADB installer was very helpful!! It fixed problems I was having on the PC I was using to flash my phone. Much thanks to @Snoop05 for the ADB installer for the PC. It keeps you from having to install the full SDK for Android.
Thread moved to proper forum.

New XZ4T owner - a couple of questions

Hi:
I have an XTZ and decided to get this tablet over a newer one such as a Samsung S3 9.7" as I *much* prefer the 16:9/16:10 aspect ratio over 4:3 and I couldn't find anything else. I have a couple of questions about it.
1) If I never will use LTE, is there any reason to get the SGP771 over the SGP712? This is from a usability/issues standpoint as well as rooting/roming/etc. I will most likely run stock but I like having root so I can do what I want with it (e.g., my XTZ is rooted stock and I'm just fine with that).
2) I've just begun reading these forums but I see references to newer firmware than I see download threads for on this site. Is it just totally stock firmware or is there some other site or file host that has newer rooted, stock images? I know about I saw a reference to "mega" but I have yet to figure out what that is and I see tools like XperiFirm over in the cross-device section. It's been a 2 years since I last did anything to my XTZ (it's still on one of the early Lollipop releases ) so maybe I already learned all this and forgot

Anyone have a copy of the "Aurora.N7.Port.v2.1_data/sms fix for Sprint" or "Aurora.N7.Port.v3_data/sms fix for Sprint" files?!

IS THIS FORUM "DEAD" or something?! I've been BANGING my head against a WALL for about a month now trying to fix an apparent "Sms over Sgs" function being disabled on my N910P running LineageOS, if I use anything but a stock OS I'm not able to "send" SMS unless I switch to 3G. Does anyone possibly have the following files kicking around? The links to them are dead everywhere I've looked. That or any other bright ideas? Do I need to flash the baseband again after installing Lineage or something?
Aurora.N7.Port.v2.1_data/sms fix for Sprint
Aurora.N7.Port.v3_data/sms fix for Sprint
Hya! So I am in the same boat... I am trying to do research... So far I have not been finding anyone with answers past the N7 Port. I cant even seem to be able to install the ROM cuz I am on Q15 Baseband. I udnerstand that you can't downgrade once we committed to the latest.
I also am having huge bluetooth crashes. Trying to keep attached with my FitBit and keeps dropping.
Lets see if we can find some answers together!
I tried the download of the SMS fix for Sprint and flashed it but doesnt seem to work.
Unidave199 said:
"SMS fix for Sprint"
Click to expand...
Click to collapse
Which SMS fix for Sprint? The N7 Port or a different SMS fix?
$HAKER said:
Which SMS fix for Sprint? The N7 Port or a different SMS fix?
Click to expand...
Click to collapse
Sorry, I should have given details. I found the zip on this forum here.
[ROM] [AROMA] [ULTIMATE Note 7 Hybrid] [N930PVPU1APGC] [v1.1] [updated 5/12/2017
Ultimate Note7 Hybrid aka UN7 The next generation ROM for the Sprint Galaxy Note 4! About ROM Warning: This ROM is ONLY for the Sprint SM-N910P!!! DO NOT FLASH THIS ROM ON ANY OTHER MODEL!!! If you do then please don't ask for help in...
forum.xda-developers.com
I tried loading the ROM but I think since I went from PK1 to QI5 I will not load. I was able to download the zip from the links the OP gave here
AlternateSmsMmsSendingFix_UN7_Hybrid_by.txdbstx.zip | by txdbstx for Galaxy Note 4
Download GApps, Roms, Kernels, Themes, Firmware, and more. Free file hosting for all Android developers.
androidfilehost.com
I hope I am not breaking rules by posting the links, but all credit goes to the Developers and none to me.
Let me know how your progress goes! I need a solid ROM to get full function from this phone!
Dave
Think I've tried them both already, I've gone around in so many circles it's hard to keep track...
I have learned one key through my digging, seems most things need to "match" the same generation for the OS used.
$HAKER said:
Think I've tried them both already, I've gone around in so many circles it's hard to keep track...
I have learned one key through my digging, seems most things need to "match" the same generation for the OS used.
Click to expand...
Click to collapse
Fix for GSM based N7 ROMs to enable sms on Sprint Network (CDMA)
This thread is specified in talking about datafix for Note 7 port ROMs using N910P on Sprint Network (CDMA). There are other threads on datafix, but they are mainly for using N910P on GSM network. Kudos to XeoNoX for the datafix files for...
forum.xda-developers.com
May be helpful?
Unidave199 said:
May be helpful?
Click to expand...
Click to collapse
Unfortunately those links were dead the first time I tried them a few months ago... Thanks though. The only real shred of hope I seem to have left is an older post that someone apparently flashed the baseband files from the last OS that "worked" and they got things functioning on the newer OS. Now I just have to figure out how to flash the baseband separately from the OS?! I think I can do that with Heimdall?
$HAKER said:
Unfortunately those links were dead the first time I tried them a few months ago... Thanks though. The only real shred of hope I seem to have left is an older post that someone apparently flashed the baseband files from the last OS that "worked" and they got things functioning on the newer OS. Now I just have to figure out how to flash the baseband separately from the OS?! I think I can do that with Heimdall?
Click to expand...
Click to collapse
I thought we couldnt go back from the QI5 firmware... or did I miss something?
This really seems like a super simple solution that shouldnt be this hard. It really must be a software problem. I am super aggrivated ... probably like you.... that such a great hardware platform is being rendered so inefficent. There are no new phones that have the ability and versitility of this platform and I am committed to keeping this hardware for years to come. I dont need it to do a lot... I just need it to do the few things I require of it! I am thinking of starting a new thread in the sprint forum to get some current and collective knowledge of the best setup available for the N910P

Refurbished and guess what, messed up firmware

Hello,
I recently acquired a refurbished S9+ and as many other people, I realise now that someone must have been messing around with the internal software. This is my secondary phone so it's no big deal but I would like to understand what was done on it nevertheless, and maybe turning it back to a cleaner state, if possible, and if it has not too many drawbacks.
-apparently, Samsung Pay is not working. It hangs indefinitely on the screen where you must choose the type of security.
-when looking into the Play Store settings, the device is not certified
-WiFi calls apparently are unavailable
-OTA update is not working (nothing happens when I try to check for an update manually. What's more, no information about the last update is available. By the way, the phone software is outdated. (last Android security fix is dated from Feb 2019)
From what I read, it looks like the CSC was modified, right ? Would it be a good idea to change it back to original ? (I may need some guidance about that but we are not there yet) Would such a procedure restore, for instance, the OTA update feature ?
(see pictures attached - there is what is written on the phone's back cover too, if it can help)
Thank you very much in advance. Please tell me if you need some other specific screenshots.
PS : I also bought a Note 10+ from the same refurbisher and it ended up being a Korean model. But the firmware seems clean. I know Samsung Pay won't work in France, WiFi calls either, and I will be stuck in "LTE" 4G instead of 4G+ but at least OTA updating is functionnal (I got an update a few days ago) and honestly ? That's fine with me for the price.
Anyone ?
From what I've read researching on similar issues, the previous owner who messed around with the internal software must've flashed custom firmware on your S9+, and probably tripped Knox (and is why your Samsung Pay app won't work). According to some developers on here, you're able to hide the fact that you've rooted the phone, but I don't think you can un-trip Knox once it's been done.
Prior to your post, I didn't know a single thing about CSC and I'm not sure how it's really relevant when flashing a mobile device (unless it's carrier-related), but I think all that's required when flashing a device is the model number. Luckily, I stumbled upon a thread that is actually your exact, same model! Do what you please with it, and I hope I helped — I'm not a professional, nor am I really knowledgeable about all of this stuff, but I'm trying.
This is the thread I was talking about:
Official Stock Firmware Thread (11 August 2022) - Galaxy S9+ (SM-G965F)
UPDATE (7 APRIL 2022): Samsung has officially declared the Galaxy S9 and S9+ EOL. They will no longer be supported, and FVB4 will most probably be the final build for this device. Latest stable firmware: G965FXXUHFVG4 / G965FOXMHFVB4 /...
forum.xda-developers.com
Oh thank you for the finding, I'll have a look !
Kera Fardd said:
Oh thank you for the finding, I'll have a look !
Click to expand...
Click to collapse
You're welcome! Was it what you were searching for?
Not sure, but I hope it will help me understand the firmware/CSC stuff better
Alright so apparently this phone actually is a SM-965N, judging by what is displayed when booting into download mode.
Unfortunately I only saw this after starting a flashing attempt with Odin and now it's stuck at "system.img" so... I'm gonna let it run a few more hours but...
It's most likely bricked at this point, isn't it ? (edit : interestingly, after I forced-closed Odin and reboot the phone, it was not)
If you ask me I find this kind of "refurbishing" a little bit sketchy to say the least.

Categories

Resources