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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.

Can I flash XAC firmware on my Rogers SM-G950W?

So it's basically the title. I bought a Rogers(RWC) model of Galaxy S8 G950W and I wanna re-flash the firmware to an unbranded one like the XAC one. The thing is I saw that the Rogers baseband is not unlocked and the XAC is an unlocked one. Can I flash the unlocked firmware on a unlocked one? RWC to XAC
Cheers!

Yes you can, but don't assume that you will unlock your phone after you flash that firmware. If you want to unlock your phone, contact other site that will offer for factory unlocking on that phone or use any gadgets tool that support on that phone.
Note: becareful of modifying the baseband of your phone mostly to those enable bootloader and Knox, cause you may brick your phone or unknown baseband.
BR.
Sent from my SM-G950F using Tapatalk

emilTECH said:
Yes you can, but don't assume that you will unlock your phone after you flash that firmware. If you want to unlock your phone, contact other site that will offer for factory unlocking on that phone or use any gadgets tool that support on that phone.
Note: becareful of modifying the baseband of your phone mostly to those enable bootloader and Knox, cause you may brick your phone or unknown baseband.
BR.
Sent from my SM-G950F using Tapatalk
Click to expand...
Click to collapse
The only reason I want XAC is because it's unbranded and without bloatware apps. I think my phone is already carrier unlocked because when I bought it I specified that I will use it in another country. I've been using it with no issues in Romania for half a year now. What do you mean with baseband modifying? I will just flash the exact same firmware as the one I have now but from XAC not RWC. It's my first time doing this. I've did a lot of research but I'm still a bit worried about doing it.

No need to flash anything you can simply change the csc to xac and it'll wipe the phone.

so was their any problem?
i see both rogers and xac on sammobile
which is better?

[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.

unlocked G950U CSC/update confusion

Sorry for a noob question. I haven't been here since my days with an S3.
I pick up an supposedly unlocked G950U on ebay a week or so ago. When I got it It had G950USQU3CRE9 from 6/18 firmware installed. I put in my Mint Mobile SIM and it worked and had no carrier bloatware, but would fail when doing a manual update. Strangely in settings the Service provider SW ver. section was absent. I downloaded at installed via Odin G950USQU5CRL2. Magically the Service provider SW ver is now in settings.
Trying a manual update it downloaded and installed G950USQU5CSA4. SWEET. But I'm confused why I recieved that update.
Under Service provider SW ver it now lists;
SAOMC_SM-950U_OYN_XAS_OO_0075
xxxxxxxxxxxxxxxxxxx
XAS/XAA/VZW
Who am I getting the update for? Sammobile doesn't list SA4 for CSC's XAS (unknown) or XAA (unlocked) but does for VZW
The Phone ID app lists my product code as SM-G950UZVAXAA
Am i getting the update for verizon but a XAA unbloated one? or what? I would think XAS would be my active CSC.
Confused .... My last time playing with phones CSC didn't exist and I can't figure it out.
Also, I would love to flash the G950U1 firmware but there isn't a version a current as SA4, even the pie betas, and concerned about a brick.
Any help in understanding would be GREATLY appreciated.

6shuter said:
Sorry for a noob question. I haven't been here since my days with an S3.
I pick up an supposedly unlocked G950U on ebay a week or so ago. When I got it It had G950USQU3CRE9 from 6/18 firmware installed. I put in my Mint Mobile SIM and it worked and had no carrier bloatware, but would fail when doing a manual update. Strangely in settings the Service provider SW ver. section was absent. I downloaded at installed via Odin G950USQU5CRL2. Magically the Service provider SW ver is now in settings.
Trying a manual update it downloaded and installed G950USQU5CSA4. SWEET. But I'm confused why I recieved that update.
Under Service provider SW ver it now lists;
SAOMC_SM-950U_OYN_XAS_OO_0075
xxxxxxxxxxxxxxxxxxx
XAS/XAA/VZW
Who am I getting the update for? Sammobile doesn't list SA4 for CSC's XAS (unknown) or XAA (unlocked) but does for VZW
The Phone ID app lists my product code as SM-G950UZVAXAA
Am i getting the update for verizon but a XAA unbloated one? or what? I would think XAS would be my active CSC.
Confused .... My last time playing with phones CSC didn't exist and I can't figure it out.
Also, I would love to flash the G950U1 firmware but there isn't a version a current as SA4, even the pie betas, and concerned about a brick.
Any help in understanding would be GREATLY appreciated.
Click to expand...
Click to collapse
Xaa is unlocked firmware. I think xas is sprint. But the third vzw means your sales code is verizon so you should be getting updates from them. You can use sammobile or updato get the latest and flash home csc with your sim in and it should go to your carrier. 5th digit from end is bootloader revision thats what you have to pay attn to. As long as you get revision 5 firmware ypur gold. We have locked bootloaders so you cant really brick with odin. You have to flash a rev 5 combination file then the u1 firmware which is the unlocked firms
So what i think is you got a sprint phone with unlocked firmware but with verizon as a sales code for end user if im not mistaken... If thats the case it is most def unlocked sim wise.

I have a couple of noob questions as well Since I'm new to CSC era...
Got s8 950U and was not able to update FW for several months now due to no functioning OTA and Odin failed as I lack the combination file knowledge. My phone appears to be for Hong Kong market with Snapdragon and I use it in Europe.
1) Is it possible to unlock OTA by switching CSC to local provider? Not sure if 950U is even supported in Europe CSCs? What if I pick XAA instead of local one?
2) Any idea how to update to Pie and unlock OTA/Samsung Pay/Secure folder etc.? What is the correct formula to understand which combination file to use before flashing latest Pie 950U1 XAA ROM G950U1UEU5DSC1?

Nobody able to help at least slightly?

i have the same problem with my s8 , thar has csc of hong kong tgy and won't me let download the last updates also i can't open samsung health secure folder s pay ect....any solution ??! ,, thanks in advance

I have the same issue. Phone name is SM-G950U but CSC is TGY (Hongkong). It can not be updated via OTA and I don't know what is its correct CSC.

Rooted Extreme Syndicate s8 g590U (update to BST CSC)
TheMadScientist said:
Xaa is unlocked firmware. I think xas is sprint. But the third vzw means your sales code is verizon so you should be getting updates from them. You can use sammobile or updato get the latest and flash home csc with your sim in and it should go to your carrier. 5th digit from end is bootloader revision thats what you have to pay attn to. As long as you get revision 5 firmware ypur gold. We have locked bootloaders so you cant really brick with odin. You have to flash a rev 5 combination file then the u1 firmware which is the unlocked firms
So what i think is you got a sprint phone with unlocked firmware but with verizon as a sales code for end user if im not mistaken... If thats the case it is most def unlocked sim wise.
Click to expand...
Click to collapse
Will this work for my Rooted Extreme Syndicate s8 g590U nougat? mine says BST/BST/VWZ. (not able to receive SMS texts) Possible to flash DTA6 home CSC without breaking root to update my carrier?

SM-G950U switch to Unlocked ROM?

I have a Sprint Galaxy s8, but I am no longer on Sprint.
Is it possible for me to flash the unlocked ROM, effectively making it SM-G950U1?
My current build nnumber: R16NW.G950USQU5CSA4
I'm hoping when it's available I can flash to the Pie version of G950U1.

lioncat55 said:
I have a Sprint Galaxy s8, but I am no longer on Sprint.
Is it possible for me to flash the unlocked ROM, effectively making it SM-G950U1?
My current build nnumber: R16NW.G950USQU5CSA4
I'm hoping when it's available I can flash to the Pie version of G950U1.
Click to expand...
Click to collapse
Only if Sprint unlocked the device through uicc unlock. If you flash u1 on a locked it's still stuck to the original carrier. As for guides there are several guides in the general section for carrier switching

lioncat55 said:
I have a Sprint Galaxy s8, but I am no longer on Sprint.
Is it possible for me to flash the unlocked ROM, effectively making it SM-G950U1?
My current build nnumber: R16NW.G950USQU5CSA4
I'm hoping when it's available I can flash to the Pie version of G950U1.
Click to expand...
Click to collapse
Yes it is. I just did it yesterday. I was on G950USQS5CSB1 and didn't get wifi calling or VoLTE on Mint Mobile but after flashing G950U1 I now have them.
Since you say you are no longer on Sprint I assume you just want the unbranded G950U1 firmware.
Using samfirm on your computer putin G950U1 as phone and XAA as CSC and search. You should get G950U1UES5CSB2. It is the latest and has the same bootloader as you. Download it.
Download and use the 3B modded version of Odin.
Back up your phone as it will be wiped.
study here how to use Odin..... there are many guides
Use the CSC file not Home_CSC.
Have the sim of your current carrier in the phone when you flash.

6shuter said:
Yes it is. I just did it yesterday. I was on G950USQS5CSB1 and didn't get wifi calling or VoLTE on Mint Mobile but after flashing G950U1 I now have them.
Since you say you are no longer on Sprint I assume you just want the unbranded G950U1 firmware.
Using samfirm on your computer putin G950U1 as phone and XAA as CSC and search. You should get G950U1UES5CSB2. It is the latest and has the same bootloader as you. Download it.
Download and use the 3B modded version of Odin.
Back up your phone as it will be wiped.
study here how to use Odin..... there are many guides
Use the CSC file not Home_CSC.
Have the sim of your current carrier in the phone when you flash.
Click to expand...
Click to collapse
This is exactly what I'm doing. Switched to Mint, but don't heav Wifi or VoLTE. Glad to hear that G950U1 works with both those (was worried I would have to flash TMO to get it).
Thanks again!