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ATT unlocked G950U is not updating. Stuck at April firmware

So I got an ATT S8 the G950U version. I unlocked it via ATT with their unlock code.
since then using it on Indian carrier Airtel. I am not been able to get any software updates. Whenever I check for the updates it says its up to date. But its stuck at build number G950USQU1AQC9 and security patch of 1 march 2017.
How do I update this? Do I need to flash ATT software via ODIN? but I need to retain the unlocked status.

You wont get OTA unless you have an ATT sim in it i Think. Just flash G950U1 firmware which is the unlocked version sold by samsung.
I bought a sprint s8 and flashed G950U1 firmware and using on Airtel. Moreover you wont have any carrier bloatware.

It seems Smart Switch also updates when applying initialize. Not connecting your phone before starting up SS gives you the option to input model - and serial #.
And to my knowledge, once unlocked (free to use any SIM) stays unlocked.

suryakiran_r said:
You wont get OTA unless you have an ATT sim in it i Think. Just flash G950U1 firmware which is the unlocked version sold by samsung.
I bought a sprint s8 and flashed G950U1 firmware and using on Airtel. Moreover you wont have any carrier bloatware.
Click to expand...
Click to collapse
Did you flash it with Odin? AFAIK its the only way for snapdragon models. Been away from android tinkering for a long while. Can you point me to relevant threads?
P.S. Are you able to get OTA now?

I have a similar issue but in the UK. Can't see OTA updates and it says up to date in Smart Switch. Is flashing the stock firmware risky or break knox? What are my options?

Search Updato.com for the latest G950U1 firmware. (XAA version is the best region to use in your case). Use THIS version of Odin to flash: http://dl.psouza4.com/android/Odin3_v3.12_PrinceComsy.zip
You will not get updates normally if you don't. Your phone is trying to contact AT&T servers but you don't have their sim card so it's not going to let you download it.

joe3681 said:
Search Updato.com for the latest G950U1 firmware. (XAA version is the best region to use in your case). Use THIS version of Odin to flash: http://dl.psouza4.com/android/Odin3_v3.12_PrinceComsy.zip
You will not get updates normally if you don't. Your phone is trying to contact AT&T servers but you don't have their sim card so it's not going to let you download it.
Click to expand...
Click to collapse
Be careful, the latest u1 firmware is a rev2 bootloader. It will probably be rootable like the n8 one is but no one has confirmed yet. There are also no ready to flash rooted ROMs with it

Root is worthless anyway.

SM-T827R (US Cellular) flashed with T827V (Verizon Oreo) - Working no issues

I purchased a US Cellular branded Tab S3 to use on AT&T when I found out they sell them unlocked. I also recently wanted Oreo on it and after some digging found US Cellular still hasn't released an update but there was one from Turkey and one from VzW. I tried to find a concrete yes/no if I can flash other variants of the T827 models firmware without luck so figured I'd roll the dice on it myself. This weekend I tracked down the VzW Oreo firmware and used Odin to install it on my US Cell Tab. The first round I had a couple of errors and for a second thought I had a new paper weight, but kept calm and ran through the process again and it worked!
Just a note:
At first boot it will say the SIM is invalid and to put in a VzW SIM, but you can click ok and keep going. Once done setting up on wifi you can then go into settings and add the AT&T APN and connect over cell.

Could you post where you got the VZW image? I'd like to try this. I can't believe USC hasn't updated their tabs yet. I'm tired of asking when the update will arrive!

alfredtv said:
I purchased a US Cellular branded Tab S3 to use on AT&T when I found out they sell them unlocked. I also recently wanted Oreo on it and after some digging found US Cellular still hasn't released an update but there was one from Turkey and one from VzW. I tried to find a concrete yes/no if I can flash other variants of the T827 models firmware without luck so figured I'd roll the dice on it myself. This weekend I tracked down the VzW Oreo firmware and used Odin to install it on my US Cell Tab. The first round I had a couple of errors and for a second thought I had a new paper weight, but kept calm and ran through the process again and it worked!
Just a note:
At first boot it will say the SIM is invalid and to put in a VzW SIM, but you can click ok and keep going. Once done setting up on wifi you can then go into settings and add the AT&T APN and connect over cell.
Click to expand...
Click to collapse
Not sure that was a good idea. If indeed you did manage to flash the VZW bootloader then the tablet is now likely bootloader locked with no way of returning to its original state.

ashyx said:
Not sure that was a good idea. If indeed you did manage to flash the VZW bootloader then the tablet is now likely bootloader locked with no way of returning to its original state.
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Was this verified to be the case? Also would the verizon combination file work on the uscelluar tablet? I picked up a cheap SM-T827R4 that is FRP locked. I am waiting to hear back from the original owner if they would be willing to bypass the verification for me.

Writermike said:
Was this verified to be the case? Also would the verizon combination file work on the uscelluar tablet? I picked up a cheap SM-T827R4 that is FRP locked. I am waiting to hear back from the original owner if they would be willing to bypass the verification for me.
Click to expand...
Click to collapse
I was able to flash the combo file for the SM-T827V (Verizon version of the Tab S3) to bypass the FRP lock. I used the one on gsm-firmware.com After which I was able to reflash the uscelluar firmware from sammobile. I don't know if this is exactly the same as the OP's method, but hope it helps someone else out in the future.

Writermike said:
I was able to flash the combo file for the SM-T827V (Verizon version of the Tab S3) to bypass the FRP lock. I used the one on gsm-firmware.com After which I was able to reflash the uscelluar firmware from sammobile. I don't know if this is exactly the same as the OP's method, but hope it helps someone else out in the future.
Click to expand...
Click to collapse
Sorry for the late reply on this. I downloaded the image files from sammobile and installed them with odin. I've been up and running on Oreo (VzW branded) since my post and have had no issues or reasons to flash to anything else. I have tried to run an update but it says it can't register, which i assume is because it's hitting the VzW servers w an ATT SIM from a USC device!
Sent from my SM-G955U using Tapatalk

alfredtv said:
I have tried to run an update but it says it can't register, which i assume is because it's hitting the VzW servers w an ATT SIM from a USC device!
Sent from my SM-G955U using Tapatalk
Click to expand...
Click to collapse
You just need to put a Verizon SIM in it once (and so far only once) to check for updates. The SIM doesn’t even need to be provisioned. Then you can check for updates with your normal SIM.
I’ve had a VZW Tab S3 for over a year that I have been using with AT&T. I updated to Oreo without any issues with my AT&T SIM installed.

Wanted to first say thanks for the tip -- and echo that The T827R4 does in accept the Verizon Oreo firmware via the latest version of Odin, though with a build just a few releases behind it threw an error and would not flash.
I guess if we can't have root we may as well have Oreo.

Samemobile has the January security update Oreo
alfredtv said:
I purchased a US Cellular branded Tab S3 to use on AT&T when I found out they sell them unlocked. I also recently wanted Oreo on it and after some digging found US Cellular still hasn't released an update but there was one from Turkey and one from VzW. I tried to find a concrete yes/no if I can flash other variants of the T827 models firmware without luck so figured I'd roll the dice on it myself. This weekend I tracked down the VzW Oreo firmware and used Odin to install it on my US Cell Tab. The first round I had a couple of errors and for a second thought I had a new paper weight, but kept calm and ran through the process again and it worked!
Just a note:
At first boot it will say the SIM is invalid and to put in a VzW SIM, but you can click ok and keep going. Once done setting up on wifi you can then go into settings and add the AT&T APN and connect over cell.
Click to expand...
Click to collapse
I just updated to Oreo for SM-T827R4 to January security patch 8.0.0 firmware from Sammobile and it working great.

my370z said:
I just updated to Oreo for SM-T827R4 to January security patch 8.0.0 firmware from Sammobile and it working great.
Click to expand...
Click to collapse
You're right about Verizon firmware running really smooth. Much better than the US Cellular firmware. After flashed VZ firmware, the model changed to SM-T827V.

in case anyone has the us cellular model, you really don't need to flash the verizon firmware because the us cellular model has a more updated firmware than the verizon model.
the model is actually SM-T827R4, oreo with apr 2019 security and OTA update works too.
though no pie update yet (same as verizon)

So these can't be flashed to the stock 820 pie rom?

picachux said:
So these can't be flashed to the stock 820 pie rom?
Click to expand...
Click to collapse
good news, the official pie is available now, OTA downloading now
Verizon model still stuck at oreo

supaet said:
good news, the official pie is available now, OTA downloading now
Verizon model still stuck at oreo
Click to expand...
Click to collapse
Thanks for the heads up will check when I get home.
Sent from my SM-T827R4 using Tapatalk

[Q]Can Unlocked Phone Use Any Carrier Rom?

Hello, i am using ATT Galaxy S8 SM-G950U Unlocked Phone. When i am going to search any new update or firmware for my phone, i rarely find them even in sammobile I find most T mobile, verizon, sprint updates or firmware than ATT. So can i use other carrier rom for my device Or i have to stick with this ATT? Currently im using may 2018 firmware for my device. I searched a lot for newer firmware but couldnt get any. And can u tell me when the pie update will come for this device.
Also can i install pie beta on my phone? Bcoz its tells that it will work on snapdragon but doesnt tell att or t mobile or verizon...

ariyangd said:
Hello, i am using ATT Galaxy S8 SM-G950U Unlocked Phone. When i am going to search any new update or firmware for my phone, i rarely find them even in sammobile I find most T mobile, verizon, sprint updates or firmware than ATT. So can i use other carrier rom for my device Or i have to stick with this ATT? Currently im using may 2018 firmware for my device. I searched a lot for newer firmware but couldnt get any. And can u tell me when the pie update will come for this device.
Also can i install pie beta on my phone? Bcoz its tells that it will work on snapdragon but doesnt tell att or t mobile or verizon...
Click to expand...
Click to collapse
Al Us s8s are the same there are guids for carrier switching but all the recent formwares are on updato or sammobile. Should be able try try the pie beta. Im stuck on 7..0 since im rooted so no pie for I ???

TheMadScientist said:
Al Us s8s are the same there are guids for carrier switching but all the recent formwares are on updato or sammobile. Should be able try try the pie beta. Im stuck on 7..0 since im rooted so no pie for I ???
Click to expand...
Click to collapse
But in sam mobile and updato i find all carrier firmware except att. And thats worrying me much. I want to update but theres no att firmware. And if i use others firmware will i face any problem?

ariyangd said:
But in sam mobile and updato i find all carrier firmware except att. And thats worrying me much. I want to update but theres no att firmware. And if i use others firmware will i face any problem?
Click to expand...
Click to collapse
Other firmwares will work you might just be missing features like WiFi calling. I don't know the exact dialer code but they is a preconfig dialer code to select csc so once you got the latest you could try that. All the firnwares are identical for each us model you wont brick from flashing another carriers

So thats yes right? I can use other carrier rom without any problem?

please some one answer... my device is att s8 smg950u. so can i use smg950u1 firmware to flash 950u?

ariyangd said:
please some one answer... my device is att s8 smg950u. so can i use smg950u1 firmware to flash 950u?
Click to expand...
Click to collapse
As long as it's unlocked. A g950 u. U1 and w all can use any csc from carrier firmware. Pop your sim in and flash your carriers csc from firmware

My phone is G950U but it's made in China and works fine with Bulgarian SIM. I have no info about the original carrier. CSC code is TGY, can I flash G950U1 with CSC XAA (Unlocked)?

MrMef said:
My phone is G950U but it's made in China and works fine with Bulgarian SIM. I have no info about the original carrier. CSC code is TGY, can I flash G950U1 with CSC XAA (Unlocked)?
Click to expand...
Click to collapse
Did you read my previous post

TheMadScientist said:
Did you read my previous post
Click to expand...
Click to collapse
Yes, the thing is I don't have my carrier CSC available for download since I'm using it in Europe. Wondering if I need to revert flash how to source TGY (Hong Kong) factory rom? Seems all available for download are US-based CSCs only.
My main concern is OTA is currently failing completely, I am hoping to restore by moving away from the TGY code, does that need carrier switching process or just flash 950U1 on top including user data ?

MrMef said:
Yes, the thing is I don't have my carrier CSC available for download since I'm using it in Europe. Wondering if I need to revert flash how to source TGY (Hong Kong) factory rom? Seems all available for download are US-based CSCs only.
My main concern is OTA is currently failing completely, I am hoping to restore by moving away from the TGY code, does that need carrier switching process or just flash 950U1 on top including user data ?
Click to expand...
Click to collapse
Im pretty sure u1 model pretty much is csc-less i would try to flash the u1 firmware directly and flash the home csc in u1 firmware which should leave it open. BL" "AP" "CP" "CSC" is all you should flash. User data would add a carrier. If you dont it will leave it open.....
If updates are all your lookong for. Just use odin to manually update

TheMadScientist said:
Im pretty sure u1 model pretty much is csc-less i would try to flash the u1 firmware directly and flash the home csc in u1 firmware which should leave it open. BL" "AP" "CP" "CSC" is all you should flash. User data would add a carrier. If you dont it will leave it open.....
If updates are all your lookong for. Just use odin to manually update
Click to expand...
Click to collapse
I tried 950U XAS and 950U1 downloaded with SamFirm and all versions of Odin but all failed . Strange my S7 from Verizon is able to use OTA in Bulgaria but not this Hong Kong S8.

MrMef said:
I tried 950U XAS and 950U1 downloaded with SamFirm and all versions of Odin but all failed . Strange my S7 from Verizon is able to use OTA in Bulgaria but not this Hong Kong S8.
Click to expand...
Click to collapse
You are either using the wrong odin or a older firmware.
Or. To flash unlocked firmware you must first flash the combination file then unlocked firmware.

Firmware change question

Hey guys,
I am currently on Samsung S10+ in Canada, which has a single SIM and unlocked. As I need a dual SIM now, I am planning to sell it off and get an international model with dual sim.
My question is: Do I need to change the new phone's firmware to Canada to get OTA official updates? Can it be changed?
Thanks!

The answer is no. You cannot flash the Canadian firmware on the international version. For starters, the international version is Exynos chip. Also, Samsung Pay will not work in Canada with the international version.

dhorgas said:
The answer is no. You cannot flash the Canadian firmware on the international version. For starters, the international version is Exynos chip. Also, Samsung Pay will not work in Canada with the international version.
Click to expand...
Click to collapse
Thanks so much for the reply! So what about updates? Will I still be able to get them without changing the Firmware (as you mentioned I can't anyways)? Yes, heard about Samsung Pay, but I don't use it much so that should be ok. But I wish we had an option for Dual SIMS here in Canada
Thanks again!

You will not be able to get Canadian OTA updates. You will have to download international firmware releases compatible with your device and flash them.

rajpotula said:
Hey guys,
I am currently on Samsung S10+ in Canada, which has a single SIM and unlocked. As I need a dual SIM now, I am planning to sell it off and get an international model with dual sim.
My question is: Do I need to change the new phone's firmware to Canada to get OTA official updates? Can it be changed?
Thanks!
Click to expand...
Click to collapse
You will get updates normally but not same as the Canidian model. so if local s10 get update dosent me you will and same way other way. When ur model code has an update you will receive it ... so dont worry u can buy and you will get OTA normally ... or you can flash other FW on it but i dont know about snap and exn .. I always flash my Brazilian s10+ with eurpian verison and leave HOME CSC so SamsungPay still brazilian.

No Firmware available for S8 ATT

I have an unlocked S8 from ATT currently on T-Mobile with Android Version 7, i would like to upgrade to 9 but the CSC version for ATT doesn't seem to be available in updato or SamMobile, for some reason the ATT CSC its only available in samsung version SM-G950U1 but my device apparently its SM-G950U. Not sure what to do I'm new at this and don't want to brick my phone any further assistance its gladly appreciate it ! happy V-DAY ~~

zephirop said:
I have an unlocked S8 from ATT currently on T-Mobile with Android Version 7, i would like to upgrade to 9 but the CSC version for ATT doesn't seem to be available in updato or SamMobile, for some reason the ATT CSC its only available in samsung version SM-G950U1 but my device apparently its SM-G950U. Not sure what to do I'm new at this and don't want to brick my phone any further assistance its gladly appreciate it ! happy V-DAY ~~
Click to expand...
Click to collapse
You can download any of the firmware. Use the oyn part csc. It will auto personalize off your att sim. The firmware are multi carrier now.

TheMadScientist said:
You can download any of the firmware. Use the oyn part csc. It will auto personalize off your att sim. The firmware are multi carrier now.
Click to expand...
Click to collapse
thank you for the fast response what is the "Oyn Part ?

zephirop said:
thank you for the fast response what is the "Oyn Part ?
Click to expand...
Click to collapse
When you download any firmware it will have a home csc and a regular. I call that one the oyn.
I have a xfinity mobile s8. I swapped to cricket. Just like att firmware is nearly unheard of. Specially on bit 7. So I flashed the multi oyn csc and inserted my cricket sim. The phone reboots and will automatically personalize with all the cricket bloat ware all the cricket settings. Despite not having a cricket firmware released at the time. All the g950u s are the same hardware so you can safely flash any g950u firmware any carrier as long as in the build number 5th digit from far end matches. Like mines a 7. So 5th digit from far end in build must be a 7 or greater

TheMadScientist said:
When you download any firmware it will have a home csc and a regular. I call that one the oyn.
I have a xfinity mobile s8. I swapped to cricket. Just like att firmware is nearly unheard of. Specially on bit 7. So I flashed the multi oyn csc and inserted my cricket sim. The phone reboots and will automatically personalize with all the cricket bloat ware all the cricket settings. Despite not having a cricket firmware released at the time. All the g950u s are the same hardware so you can safely flash any g950u firmware any carrier as long as in the build number 5th digit from far end matches. Like mines a 7. So 5th digit from far end in build must be a 7 or greater
Click to expand...
Click to collapse
So in this case i just need to download a T-Mobile firmware and flash using Odin ? as long as is for the same model number should work?

zephirop said:
So in this case i just need to download a T-Mobile firmware and flash using Odin ? as long as is for the same model number should work?
Click to expand...
Click to collapse
Yea g950u and what ever bit number. Tmobile was the original so probably best but dont matter

TheMadScientist said:
Yea g950u and what ever bit number. Tmobile was the original so probably best but dont matter
Click to expand...
Click to collapse
It seems that my build number 5th digit from the far end >> its 1
this phone was originally AT&T but has been factory unlocked i'm currently using it on Tmobile with no issues. I'm going to try with Tmobile firmware and odin and will give it a try hoping for the best

zephirop said:
It seems that my build number 5th digit from the far end >> its 1
this phone was originally AT&T but has been factory unlocked i'm currently using it on Tmobile with no issues. I'm going to try with Tmobile firmware and odin and will give it a try hoping for the best
Click to expand...
Click to collapse
If you stay on 1 then it's super easy if you ever want root your phones pretty much never been updated then

TheMadScientist said:
If you stay on 1 then it's super easy if you ever want root your phones pretty much never been updated then
Click to expand...
Click to collapse
thank you for the assistance and your fast responses i appreciate your help !!

zephirop said:
thank you for the assistance and your fast responses i appreciate your help !!
Click to expand...
Click to collapse
No problem mate. I dont have anything better to do. ???

zephirop said:
It seems that my build number 5th digit from the far end >> its 1
this phone was originally AT&T but has been factory unlocked i'm currently using it on Tmobile with no issues. I'm going to try with Tmobile firmware and odin and will give it a try hoping for the best
Click to expand...
Click to collapse
How did it turn out mate?

TheMadScientist said:
How did it turn out mate?
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Click to collapse
It turned out great i downloaded latest tmobile firmware flashed with Odin like butter !! Seems all of the tmobile features work fine. Thanks a lot you made what i thought would be a sketchy process into an ease. Are all new samsung devices multi csc ?

zephirop said:
It turned out great i downloaded latest tmobile firmware flashed with Odin like butter !! Seems all of the tmobile features work fine. Thanks a lot you made what i thought would be a sketchy process into an ease. Are all new samsung devices multi csc ?
Click to expand...
Click to collapse
pretty much
as long as its unlocked properly just pop what ever US carrier sim in and go it should repersonlize every time

Similar - I have Oreo but I can't get Pie.
I have an unlocked Galaxy S8 (SM-G950U) and I'm using it on an Indian carrier. I can't get OTA updates since I don't have an AT&T sim. I checked SamMobile for firmware updates but couldn't find one for SM-G950U. I want to update to Pie and get One UI features but I couldn't. What should I do?