My girlfriend is selling her old Tmobile Samsung Galaxy S2 sgh-t989 that had Android 4.02 on it asked me to clean it up so she could sell it because it ran very slow so I installed Cyanogenmod because its lightweight and also assuming it would unlock it for the carriers. After a bit of reading, on this forum I discovered my assumptions we're wrong. Now my question is this, the person who she sold it to is on AT&T. With Cyanogenmod on it, if she calls up AT&T will they still be able to unlock it or should I flash it with a stock rom?
bump
Better flash stock rom...
I really dont know about carrier locked phones (no such trend in india) but still it would be better or else one may say that the phone has been tempered(correct word??) wid
You can not unlock it on custom ROMs with apps, only from pc at a service store(perhaps), on stock 4.1.2 it is possible with various apps like GalaxSim( I recommend it, altho it's paid nowadays) and Chainfire's app(I don't think it works anymore though)
It's possible, I used the old version of galaxsim to unlock my Telstra locked i9100t and it worked like a charm. I'm pretty sure you can get it free as an apk.
i'm not sure if this is possible, but was wondering if there was a way to flash a certain firmware on our edge phones to make it carrier agnostic? I came from a Nexus 5 so we could flash different versions of the OS to either the international version or the US version, etc. Can we do that with these locked phones? Is it possible to say flash a Sprint phone with the ATT firmware? or is the hardware actually different in the phones?
There may be partition and bootloader variations especially with the ATT and Sprint versions so I wouldn't risk it. Roms however are a different story as long as you have a compatible kernel.
I just got a new unlocked AT&T M8, switched over from iPhone. I'm going to be using it with T-Mobile, and I'm still struggling to learn how all this stuff works. So the phone is running on Android 4.4.4 currently, and I want to install a custom ROM on it, but I need Android 5.0. Since I have a T-Mobile sim card, I don't have any OTA updates. From what I understand, if I wanted to switch to a T-Mobile ROM, I'd have to pay $25 for Sunshine, which I'd rather not do. Would I also need to do so to get an international ROM? Also, from what I'm reading, my other option is to use the AT&T RUU from HTC's website to update to 5.0, and then install a custom ROM from there. Is this correct, would that remove my unlock, and are there instructions/recommended readings before I try anything? Thanks for any help.
grant523 said:
I just got a new unlocked AT&T M8, switched over from iPhone. I'm going to be using it with T-Mobile, and I'm still struggling to learn how all this stuff works. So the phone is running on Android 4.4.4 currently, and I want to install a custom ROM on it, but I need Android 5.0. Since I have a T-Mobile sim card, I don't have any OTA updates. From what I understand, if I wanted to switch to a T-Mobile ROM, I'd have to pay $25 for Sunshine, which I'd rather not do. Would I also need to do so to get an international ROM? Also, from what I'm reading, my other option is to use the AT&T RUU from HTC's website to update to 5.0, and then install a custom ROM from there. Is this correct, would that remove my unlock, and are there instructions/recommended readings before I try anything? Thanks for any help.
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You probably want the T-Mob radio software, so you can enable the 3G and LTE bands used by T-Mob. Otherwise, you will find that the AT&T radio does not give you 3G and LTE in many locations.
In order to flash another carrier's radio, you need s-off, and there is no way around that. Then you need to change the carrier ID (CID) and model ID (MID) to that of T-Mob.
At that point, you may as well RUU to a stock factory T-Mobile software image (not just the radio) and that would be recommended, is it will get you a complete T-Mobile "baseline" phone as opposed to an AT&T ROM with T-Mob radio, etc.
After running the T-Mob RUU, your phone will be "fully converted" to the T-Mob version in terms of software. Others here have converted the AT&T version for use on T-Mob. So I'll try to find one of those threads instead of trying to explain it all again.
None of these mods will change your SIM unlock. That will remain unlocked.
---------- Post added at 11:06 AM ---------- Previous post was at 10:58 AM ----------
Here you go: http://forum.xda-developers.com/att-htc-one-m8/help/installing-tmobile-rom-att-branded-phone-t3069388
Another point: You can update to the latest AT&T Lollipop software by RUU. And you can flash custom Lollipop ROMs after that. But neither of these will enable the 3G and LTE bands used by T-Mob. So that is why I suggest "converting" the phone to T-Mob stock software instead.
Thanks for the response! Appreciate it. A few more questions, since I'm not sure I fully grasp the concept of radios.
If I first flash a T-Mobile ROM, and then install a custom ROM, is that any different from updating with a AT&T RUU and then installing a custom ROM? Will I still be missing the bands?
If yes, then should I just stay away from Custom ROMs all together? Is this a problem because I bought an AT&T phone?
Thanks again!
grant523 said:
Thanks for the response! Appreciate it. A few more questions, since I'm not sure I fully grasp the concept of radios.
If I first flash a T-Mobile ROM, and then install a custom ROM, is that any different from updating with a AT&T RUU and then installing a custom ROM? Will I still be missing the bands?
If yes, then should I just stay away from Custom ROMs all together? Is this a problem because I bought an AT&T phone?
Thanks again!
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Yes it's different the AT&T ruu won't give you the T-Mobile bands. And you can install custom roms if you want but I would reccomend paying the $25 to s-off and fully converting to t-mobile and either stay on stock or flash a custom t-mobile rom
grant523 said:
A few more questions, since I'm not sure I fully grasp the concept of radios.
If I first flash a T-Mobile ROM, and then install a custom ROM, is that any different from updating with a AT&T RUU and then installing a custom ROM? Will I still be missing the bands?
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I think your first phrase was intended to read "flash the T-Mob RUU, then install a custom ROM".
The radio is not contained in the ROM, and flashing a ROM doesn't affect the radio in any way.
The radio is contained in what many folks here called the "firmware package" or firmware.zip; and it can be installed by flashing the RUU.
Another thing that will help you understand, is that the phone has something like 36 (or more) partitions. The ROM is just one of those. The radio is a separate partition (as bootloader, recovery, and others have their own separate partitions as well). Flashing one partition, does not effect the others. The RUU is a complete software image that flashes all the partitions to factory stock for a certain carrier version.
You can also flash the radio or firmware.zip manually (without flashing the whole RUU). But my personal recommendation would be to baseline to a fully stock T-Mobile software profile, since you are on the T-Mob network, to make sure every partition plays well together (as opposed to mixing T-Mob and AT&T software components).
grant523 said:
If yes, then should I just stay away from Custom ROMs all together?
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I wouldn't say that. Custom ROMs have their place. But a custom ROM will not open up the T-Mob bands. As mentioned, you can only do that by flashing the radio, which isn't affected by flashing the ROM.
After baselining to a T-Mob stock config as I've suggested, you can feel free to flash a custom recovery and flash custom ROMs if you like. But if would be for other reasons than the radio bands; such as performance, customization, debloating, etc..
grant523 said:
Is this a problem because I bought an AT&T phone?
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Basically yes. If you want to be sure a phone works fully on a certain network "out of the box", you should buy the phone that is branded for that network. Otherwise, you should always thoroughly research a phone (not branded for your carrier) before trying to use it on your network.
Luckily for you, on this device the radio bands can be changed in software using the mods I've noted above. On past devices, the band support was set in hardware, meaning where was no way to change it in software. In that case, you would really have some buyer's remorse to deal with.
Ah OK thanks for the responses! I think I'm starting to understand. I did research how an At&t m8 would work with T-MOBILE but I didn't realize i would have to go throw this whole software process to make it work! Anyhow I appreciate the help and I'll buy a Sunshine license when I get a chance. Thanks again!
You are quite welcome.
Here is a thread with more info on changing from AT&T to T-Mob software: http://forum.xda-developers.com/att-htc-one-m8/help/installing-tmobile-rom-att-branded-phone-t3069388#post60606278
Good luck!
Hi, could I flash the t-mobile firmware file or rom to the verizon lg g5? I switched to t-mobile, and am able to use the verizon phone, but lte drops to 3g for calls and lots of the time data shows up as hspa when I check the icon. If it can be done, please explain how. Thanks in advance.
No you can't flash the T Mobile firmware.
other firmwares beeing flashed on different lg g5's
So, there is no way to flash different firmwares on the verizon model, just other ones. Is this because the bootloader is locked? How can people flash a different region firmware on some of the models?
I to am curious on this, i have called LG and was told that the only difference between the T-Mobile and the Verizon LG G5, was software based, and that their was no hardware differences at all.
If that is true, why would we not be able to flash the T-Mobile rom onto our verizon phone?
DO NOT ATTEMPT THIS OR YOU WILL BRICK YOUR PHONE BEYOND ANY REPAIR. It has been said MANY times before, google it first
gigawatt said:
Hi, could I flash the t-mobile firmware file or rom to the verizon lg g5? I switched to t-mobile, and am able to use the verizon phone, but lte drops to 3g for calls and lots of the time data shows up as hspa when I check the icon. If it can be done, please explain how. Thanks in advance.
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The hardware is essentially different... Has nothing to do with locked bootloader, u could still use LGUP to flash regardless but it would likely brick your phone. Drops to 3g because of the bands used, there may be a workaround but it's unlikely.
My friend in Canada bought a US AT&T Model Z Flip 5G (which is SIM unlocked). His carrier is Telus and he's missing some Telus features.
Can he flash his Z Flip 5G with Telus (TLS) SM-F707W firmware or if needed flash the Unlocked (SM-F707U1) firmware then flash the Canadian Firmware onto this ATT Flip?
I am also looking for the answer. Last month I myself bought an AT&T Z Flip 5G from the USA (SM-F707U1). I want to flash the european firmware (SM-F707B) onto the phone. I am also willing to at least try doing it, but I won't do anything until i know the risks. What I DO know is that flashing to CSC to something else won't do any harm (like triggering knox or any kind of anti flash boobytrap by samsung). I hope someone knows anything!
LDBD said:
I am also looking for the answer. Last month I myself bought an AT&T Z Flip 5G from the USA (SM-F707U1). I want to flash the european firmware (SM-F707B) onto the phone. I am also willing to at least try doing it, but I won't do anything until i know the risks. What I DO know is that flashing to CSC to something else won't do any harm (like triggering knox or any kind of anti flash boobytrap by samsung). I hope someone knows anything!
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My friend went to a local shop and they successfully flashed the Telus (sm-f707W) onto his Flip.
If I am reading the specs about the International Flip 5G models, they also have Snapdragon Processors so flashing sm-f707b firmware might then work. I'm not 100% sure so you better do some further research to be sure.