yashsingh1/xdaforums huggingface dataset:
[Samsung Galaxy S8 Guides, News, & Discussion] Mike15678:
Try switching your CSC code to "ATT" by following the "Carrier Switching" section. Then flash the AT&T firmware by following the "Flashing Standard Firmware" section. Be advised that everything from your phone WILL be deleted. If this doesn't work, we can move on from there.

Edit: The AT&T firmware is in the "Downloads" section of the guide.
[Samsung Galaxy S8 Guides, News, & Discussion] fabioplata:
Do it, im a full att frimware, all att apps, service provider ATT/ATT/ATT

I made the process with tmobile, frimware with tmobile aps, but the service provider is TMB/TMB/ATT, the las allways is ATT, ii think that the problem and my sim card dont work.
[Samsung Galaxy S8 Guides, News, & Discussion] Chief023:
Thanks very much! I was just scared of bricking my phone. I've done tablets before, but phones are unique with all the carrier stuff. I decided to go XAA and the Unlocked firmware just in case I switch carriers again down the road. Phone seems to be working great. Haven't tried a Samsung Pay transaction, but the app opens and works, so I'm guessing I'm good there. I do have LTE now, so I guess the Verizon firmware had some bands disabled that the tower nearest my house uses. I did get LTE on the Verizon firmware when I went further into town, so I guess at least some towers in my area were using the same bands as Verizon, just not at my house.

Thanks again for the awesome post and answering newbie questions!
[Samsung Galaxy S8 Guides, News, & Discussion] fabioplata:
Update: I did again all process for the beginning, it's XAA/XAA/ATT, only work with Avantel simcard, remember was a att so the Sim it's unlock but like a show the attached Movistar and Tigo works with the same band but don't work, Avantel use Movistar or Tigo in 3g because only have 4g.. so.. what happen..
[Samsung Galaxy S8 Guides, News, & Discussion] fabioplata:
Can use a international CSS for G950F in a G950U?
[Samsung Galaxy S8 Guides, News, & Discussion] Smithfolk4:
No. The phones have differnt processors and the firmware won't work on the other phone.
[Samsung Galaxy S8 Guides, News, & Discussion] parkarintl:
Hello..

I m a newbie, bought AT&T S8 SM-G950U.

I live in india and we dont have verizon or t-mobile or At&t.

I've AT&T firmware which came with my phone and it is unlocked as i m using my indian sim in it but with At&t bloatwares shivh i disabled. Everything is working fine except the update, its not receving updates. I contacted At&t and they say for receiving updates you must use At&t number.

I'm very much confused when i saw all the firmwares avilable on updato and code in the end USA(Usc) & TMZ.

Please anyone just help me out, i just want a stock firmware to work with my indian sims and OTA updates and which odin should i use?

I've a mac can i flash firmware using mac??

Please find attached phones info

Thanks
[Samsung Galaxy S8 Guides, News, & Discussion] Sashank1923:
http://updato.com/firmware-archive-select-model?q=G950U1&exact=1

Download the firmware on the top USA(XAA).. I had the AT&T S8 with the same baseband ver. as yours. You'll get OTA updates.

Use a modded odin to flash it
[Samsung Galaxy S8 Guides, News, & Discussion] parkarintl:
Shashank firmware model is different than mine. Mine is SM-G950U and the one u wuoted is SM-G950U1.

Smithfolk4 clearly said in the 3rd last post that different model firmware wont work.

Let me know if im wrong smwhere.
[Samsung Galaxy S8 Guides, News, & Discussion] Sashank1923:
If you are trying to get unlocked firmware, OTA updates and remove the bloatware thats the one you use. I had the exact same model and same carrier s8 as yours and i did the same thing.

.. The 1st pic is the firmware i have now and the second one is what i had before
[Samsung Galaxy S8 Guides, News, & Discussion] parkarintl:
Thanks bro for the pics..thats really strange and surprisingly model number changed to SM-G950U1.. :confused:

Will try it out... :laugh:

One last question whats a modded odin??

Can u provide me a link for that?
[Samsung Galaxy S8 Guides, News, & Discussion] Thor2j:
The Odin.exe file, linked on this thread that I used 3 weeks ago just got reported by bitdefender as having a trojan virus?? Anybody else?? Is this a false positive ??
[Samsung Galaxy S8 Guides, News, & Discussion] Cinnob0n:
If I have a stock Verizon Galaxy S8 SM-G950U and it shows VZW/VZW/VZW, would I be able to get AT&T carriers features if I change the CSC and flash stock AT&T firmware?

Would AT&T even be able to assign it an IMEI I provide if I want WiFi-calling since it came from Verizon?

Also, with stock ATT firmware with the ATT CSC, would I still be able to swap sim cards and get service? If not, is there another firmware I could flash and still have AT&T features?

Thanks
[Samsung Galaxy S8 Guides, News, & Discussion] Thor2j:
Is your phone sim unlocked by Verizon or a 3rd party???
[Samsung Galaxy S8 Guides, News, & Discussion] Cinnob0n:
Yes

All Verizon phones come unlocked.

Its been fully paid off is is not under contract.
[Samsung Galaxy S8 Guides, News, & Discussion] rogueFive:
Hi. I flashed the AT&T USERDATA only on my unlocked US S8 in order to get WiFi Calling and volte, and it worked great.

However, I seem to have lost the Hiya integration that warns me of a caller being Spam and shows Caller ID on businesses that call me.

Any ideas on how to get it back, other than installing the Hiya app? It's just not the same as the integrated functionality in the Contacts/Dialer app I had.
[Samsung Galaxy S8 Guides, News, & Discussion] Thor2j:
Did u provide att with an imei number of an att phone with wifi calling??
[Samsung Galaxy S8 Guides, News, & Discussion] rogueFive:
Yeah. I actually used the chat support on att.com. I gave them my wife's iPhone 7+ IMEI but they knew it was for an iPhone and that I was calling about my S8, so I gave them my real IMEI and told them it was an AT&T branded S8. They shipped me a new SIM because the one I'm using is from my old S4. I actually cut the plastic off around the chip to make it a nano SIM when I switched from my S4 to a Moto X Pure. Apparently the SIM was provisioned for an S4, which didn't have WiFi calling or volte back then.
[Samsung Galaxy S8 Guides, News, & Discussion] Thor2j:
So they excepted your imei, interesting. Others have been told that they know It's not an att phone.
[Samsung Galaxy S8 Guides, News, & Discussion] Cinnob0n:
So would it be possible?

Please let me know
[Samsung Galaxy S8 Guides, News, & Discussion] rogueFive:
I wonder if the chat reps have the same tools as the phone reps... Maybe this person couldn't tell. I'll update everyone here once I receive the SIM and try it out.

Any ideas from anyone on the Hiya integration disappearing after flashing the att USERDATA? Is that an unlocked S8 thing only? I didn't do the carrier switch because my phone was already reporting att as the carrier, so all I did was flash the USERDATA and reboot, them set up the phone and restored a backup I made with Samsung Switch.

*UPDATE*

I've been on the phone with a few AT&T reps and had the advanced tech support team leave me a voicemail that they determined that it is an unlocked device and so it "won't have access to volte or WiFi calling". Like an idiot, I did give them my real IMEI the first time I called, but I told them it was an att branded device. I even rebooted it while on the phone with them so they could hear the att chime when it boots. Oh well. Looks like I'll be leaving att after over 10 years. If they can't get a strong signal to my house, they're not worth sticking with.

What carriers have people been able to use an unlocked phone and get volte and WiFi calling working?
[Samsung Galaxy S8 Guides, News, & Discussion] HDRules:
I also have the unlocked US S8. Do you still get LTE+ after flashing USERDATA? I'd like to have Wifi Calling but I've been getting super fast DL speeds on LTE+ and I'd hate to lose it.
[Samsung Galaxy S8 Guides, News, & Discussion] wingzfan:
Just wanted to say thanks for the super simple guide. Just flashed from T-Mobile to unlocked with zero issues. Going back seems to be just as easy so should I need to for "Samsung Premium Care" etc, it should be a breeze.
[Samsung Galaxy S8 Guides, News, & Discussion] hovanhuang:
[MENTION=8352198]Mike15678[/MENTION]

My situation is very similar with yours. i have a verizon s8 and trying to switch to ATT. I don't understand why i need Canada FW. I downloaded att stock firmware as below, its the latest 7/28 FW so i want to use it. I just don't know what should be deviate from the instruction. can you help me?
[Samsung Galaxy S8 Guides, News, & Discussion] ridimstar:
1. using carrier switching guide and combination file it seems phone will be rooted i dont want to root.

2. Can i directly flash verizon firmware over my unlocked samsung s8 gm-g950u1 from fw.update.com i need wifi calling do i need to do something additional please someone help me
[Samsung Galaxy S8 Guides, News, & Discussion] TylerG518:
Guys, guys.......

1. Your phone does not have to be rooted

2. Just follow the carrier switching guide FIRST, then the Flashing Standard Firmware guide SECOND, follow it all PRESICESELY... and all shall be well! :)

Don't forget about the prerequisites!
[Samsung Galaxy S8 Guides, News, & Discussion] sashaohio:
Hey guys need some help: I have an ATT branded phone, just switched to Verizon. When I go through the flashing process I end up with VZW/VZW/ATT. Anyway to make it all ATT? I had an 950U1 firmware before on ATT, but for some reason once I inserted verizon SIM, my MMS will not work and I can't change the APN because it is grayed out. So all this so I can use MMS :)
[Samsung Galaxy S8 Guides, News, & Discussion] Smithfolk4:
I may have misunderstood the model issue. I thought that the question I answered was regarding the use of 950U firmware on a 950F. The F is Exnos. The U is snapdragon. The U and U1 are the same hardware (Snapdragon) and should be able to interchange firmware.
[Samsung Galaxy S8 Guides, News, & Discussion] Thor2j:
U can't get rid of the last att, that's the way it is since u bought it from them. Sounds like your phone is sim locked, otherwise it should work. Check with ATT to unlock it.
[Samsung Galaxy S8 Guides, News, & Discussion] sashaohio:
Thank you for prompt response. The phone is unlocked. It was weird, factory reset did it. I thought by flashing USERDATA, I wouldn't need a reset. But anyway problem fixed - everything works!
[Samsung Galaxy S8 Guides, News, & Discussion] lancemoreland:
I have a T-Mobile S8 that I have flashed with the Unlocked firmware. I am now using it on AT&T. I have found a way to uncover the WiFi calling switch in the phone without flashing the AT&T CSC or Userdata files by using a program called Quick Shortcut Maker. Just install Quick Shortcut Maker and change the search method from Incremental search to Normal search and search "Calling". It will find access under Settings, WiFi calling. You can make a shortcut to it from there to your home page.

Here is the problem. You can turn it on but it will not stick. I am hoping that someone can figure out how to make it work from there.
[Samsung Galaxy S8 Guides, News, & Discussion] Thor2j:
Only way to make it stick is to have a legit imei to a phone with wifi calling (att) on file with att for that account.
[Samsung Galaxy S8 Guides, News, & Discussion] lancemoreland:
And if you do, will this work without having to flash the AT&T user data?
[Samsung Galaxy S8 Guides, News, & Discussion] Thor2j:
That I don't know , but I doubt it.
[Samsung Galaxy S8 Guides, News, & Discussion] lancemoreland:
I can confirm that it will not. It looks like I will need to flash the AT&T CSC file..

Can anyone tell me if flashing only the CSC file will wipe the phone?
[Samsung Galaxy S8 Guides, News, & Discussion] rogueFive:
I have only ever seen 4G LTE in the status bar. Haven't seen LTE+ since flashing the att USERDATA.
[Samsung Galaxy S8 Guides, News, & Discussion] ajituc:
Awesome guide..thanks for putting it together

Awesome guide..thanks for putting it together..

I have SM-G950U (US version ATT unlocked Galaxy S8) which stopped receiving updates once I came back to India. Though ATT was releasing updates frequently, I couldn't update my phone as not using ATT connection anymore.

I flashed latest unlocked firmware version (G950U1OYM1AQG2 - XAA) as per instructions given and everything worked as described here.
[Samsung Galaxy S8 Guides, News, & Discussion] Mike15678:
No problem. I'm glad you enjoyed the guide.
[Samsung Galaxy S8 Guides, News, & Discussion] t12icky0:
Csc will wipe the phone..I can confirm
[Samsung Galaxy S8 Guides, News, & Discussion] shrike1978:
If I flash unlocked without changing my CSC, will I get OTA's for unlocked as they come out, or is it necessary to change CSC for that?
[Samsung Galaxy S8 Guides, News, & Discussion] Mike15678:
You don't need to change the CSC, unless you want to use another carrier. You'll receive updates from Samsung, no matter what CSC you change to for the unlocked firmware.
[Samsung Galaxy S8 Guides, News, & Discussion] monkey39:
Where exactly do you find the xxx/xxx/xxx info? Looked in 'About Phone' but don't see it.

Edit: grammar
[Samsung Galaxy S8 Guides, News, & Discussion] rogueFive:
Scroll down to the "Service provider SW ver." and look at the last line...

EDIT: trimmed quoted text
[Samsung Galaxy S8 Guides, News, & Discussion] monkey39:
Hmm, that seems to be missing on my phone.
[Samsung Galaxy S8 Guides, News, & Discussion] rogueFive:
Hmmm. You're on an S8+. This thread is specifically for the S8. Maybe they're different in that aspect. I'm running the unlocked firmware except for the att USERDATA that I flashed, so I'm not sure what part of my config is adding that item to the About Phone screen.
[Samsung Galaxy S8 Guides, News, & Discussion] lancemoreland:
I am on an S8 and I don't have the Service Provider section either.
[Samsung Galaxy S8 Guides, News, & Discussion] t12icky0:
I indeed am on the unlocked firmware. I flashed the unlocked firmware , rebooted, let it do its thing on startup, setup phone, then reflashed the att userdata file only and after that it was there(the PROVIDER SOFTWARE menu)
[Samsung Galaxy S8 Guides, News, & Discussion] lancemoreland:
Did flashing the userdata file wipe the phone and are you now able to use WiFi calling?
[Samsung Galaxy S8 Guides, News, & Discussion] t12icky0:
I don't have Wi-Fi calling cuz I'm on Cricket. But yes the userdata file wiped the phone.
[Samsung Galaxy S8 Guides, News, & Discussion] maxslug:
I'm trying to get 2G/3G CDMA support working on a SM-G950U1 purchased unlocked.

I can confirm that out of the box it works in LTE and 1x CDMA only for Verizon. This means that if you're in the boonies (Alaska in my case) and don't have LTE, only voice and SMS work. MMS (group texts) and data do not.

I *think* this is fixable by flashing the SM-G950U Verizon firmware + userdata partition, and/or changing the CSC. It's not clear to me on the 3G issue which matters : U firmware, CSC==VZW, or both?

Thoughts?

THANKS FOR ALL THIS!
[Samsung Galaxy S8 Guides, News, & Discussion] Mike15678:
Your CSC code should already be set to "VZW"; so you can just follow the "Flashing Standard Firmware" section.

Note: "U" is carrier firmware, while "U1" is unlocked firmware.
[Samsung Galaxy S8 Guides, News, & Discussion] maxslug:
I confirmed that it was "XAA" not "VZW" for my unlocked (U1) phone from B&H Video. The point of my post was trying out a "VZW" + U firmware to try and regain 3G on verizon. I have CSC="VZW" and "U" firmware from verizon on the phone now, but funny enough haven't found a good spot to cause it to lose LTE and try 3G yet. Stay tuned until I find the right mountain town, parking garage, or elevator :)
[Samsung Galaxy S8 Guides, News, & Discussion] maxslug:
I finally found a dead spot (inside a Peets Coffee) and confirmed that 3G is working on the U1 phone with the Verizon "U" firmware and CSC="VZW" changes. Still not sure if you need to do both, or if one is sufficient, but I don't really care at this point.
[Samsung Galaxy S8 Guides, News, & Discussion] themuffinman:
Quick question, I have an unlocked s8 on tmobile, I would like to flash att software to it. Do I need to flash the unlock software first then proceed to the carrier switch instructions?

edit:

Nevermind
[Samsung Galaxy S8 Guides, News, & Discussion] tkdfromnc:
I have a verizon s8 950u. Current baseband is AQG4. I cannot for the life of me get 950u1 to flash through odin. I never had any issues flashing on my s5 or s7. I have all the current drivers, s8 in download mode, and it's recognized by Odin. I get everything loaded, hit start, and it eventually fails after sitting at analysing files. Can anyone help me out?
[Samsung Galaxy S8 Guides, News, & Discussion] joshclouds:
I had same problem
[Samsung Galaxy S8 Guides, News, & Discussion] stmims1124:
You have to use the modded Odin, not the standard.
[Samsung Galaxy S8 Guides, News, & Discussion] rinnycoop121:
Please no bashing.

What does unlocked Firmware mean is this a sort of root?
[Samsung Galaxy S8 Guides, News, & Discussion] tkdfromnc:
I was using the Prince comsy version.
[Samsung Galaxy S8 Guides, News, & Discussion] monkey39:
No, just means that it's Samsung's unbranded firmware, with no carrier bloat, but also without some carrier-specific features.

Also does not mean sim unlocked - still have to get the phone unlocked by your carrier or an unlocking service in order to use other carrier sims.
[Samsung Galaxy S8 Guides, News, & Discussion] stmims1124:
That's really weird. It should work. That's all that I did with my T-Mobile G950U...just downloaded the latest XAA U1 firmware from updato.com and used the modded Prince Comsy Odin.

Maybe the download for your firmware had an issue? I'm also wondering if there's more than one modded Odin floating out in the interwebs...I have too many versions on my computer to keep track. If you want, I can upload the firmware and the version of Odin I used to like Drive or something and send or post the links...just can't do it until I get home from work in about 8 hours.
[Samsung Galaxy S8 Guides, News, & Discussion] parkarintl:
Hello sashank,

Can you please tell me that as you've already flashed unlocked firmware on your s8, is VOLTE working on your phone or any other problem you faced with different operator's or mobile network??
[Samsung Galaxy S8 Guides, News, & Discussion] jeffyv2:
If I wanna flash the stock tmo hone_CSC to get tmo features do I need to also flash userdata?

If so where does the userdata file go in Odin for me to flash it?
[Samsung Galaxy S8 Guides, News, & Discussion] Mike15678:
You need to only flash the "USERDATA" file, if you would like to get T-Mobile features on an unlocked phone. The "USERDATA" file goes into the "UMS" box (in Odin). If you followed the "Prerequisites for anything you decide to do in this guide (Required)" section, you should have changed a configuration file that allows Odin to accept "USERDATA" files.

I have noticed that you have an S8+. Consider checking this guide out: https://xdaforums.com/galaxy-s8+/how-to/snap-guide-flashing-standard-fw-carrier-t3627255, as it contains firmware downloads and instructions that are more relevant. The guide was also made by me.
[Samsung Galaxy S8 Guides, News, & Discussion] Rally517:
Has thus been done on boost mobile? I've been reading but haven't found an answer. And how would I return back? I can't find boost firmware anywhere
[Samsung Galaxy S8 Guides, News, & Discussion] inneyeseakay:
No... On AT&T, you'll need ATT firmware for VOLTE and Wifi Calling to work.
[Samsung Galaxy S8 Guides, News, & Discussion] parkarintl:
Infact i flashed unlocked firmware on my s8..and my csc changed, pls find the screenshot attached..pls let me know is it fine??
[Samsung Galaxy S8 Guides, News, & Discussion] inneyeseakay:
It'll work with att, but as I said, VOLTE won't work
[Samsung Galaxy S8 Guides, News, & Discussion] themuffinman:
Thank you for the guide, everything went perfectly. I do have a question though. I flashed a tmobile s8 to att, will I get updates from att or will I have to update it manually?
[Samsung Galaxy S8 Guides, News, & Discussion] Mike15678:
If your phone now has AT&T firmware, you'll receive updates directly from AT&T. Though, AT&T has a weird way of activation on phones not purchased from them. You'll probably have to call them and provide a dummy S8 IMEI code and link it with your phone, in order to get properly activated.
[Samsung Galaxy S8 Guides, News, & Discussion] Mike15678:
Go into Download Mode by holding the Volume Down button, the Power button, and the Bixby button. Once you reach a blue screen, press the Volume Up button. On the top left, there should be a CSC code; could you tell me what it is? Once you are done, you can leave Download Mode by holding the same buttons you used to enter it.

Could you also tell me if you are using Boost Mobile America or Boost Mobile Australia?

I'll try to find the appropriate firmware files, as soon as possible, once you provide me with the information I am requesting. Have a great day!
[Samsung Galaxy S8 Guides, News, & Discussion] Rally517:
Yup give me a minute

American boost mobile

---------- Post added at 07:11 PM ---------- Previous post was at 07:02 PM ----------

205E455B5E41 this is what I seen in download mode
[Samsung Galaxy S8 Guides, News, & Discussion] :
On the top left there should be a three character code. That is your CSC code. Could you tell me what it is?
[Samsung Galaxy S8 Guides, News, & Discussion] :
Oooo lol hold on

---------- Post added at 08:30 PM ---------- Previous post was at 08:27 PM ----------

BST
[Samsung Galaxy S8 Guides, News, & Discussion] :
Thank you! I'll start looking for your firmware and will provide it to you, if I believe to have found it. I'm currently away, but I am returning to my home by tomorrow, so please bear with me.
[Samsung Galaxy S8 Guides, News, & Discussion] :
Thanks. I appreciate your help
[Samsung Galaxy S8 Guides, News, & Discussion] :
Why give them a dummy IMEI when someone can give them the actual IMEI?
[Samsung Galaxy S8 Guides, News, & Discussion] :
I should have been more clear. You can provide AT&T with an IMEI number from an on-display AT&T S8 (a dummy IMEI). IMEI numbers that aren't from AT&T won't work, as AT&T will see it as not one of theirs.
[Samsung Galaxy S8 Guides, News, & Discussion] :
Ah, i see. So one would have to physically go to an ATT store and get the imei from the display s8 then right....understood. I wonder why ATT wont allow BYOP for S8 from another carrier, if anything they're loosing potential customers.
[Samsung Galaxy S8 Guides, News, & Discussion] partcyborg:
Some of us have discovered that the CSC files are flashable via flashfire. Is this a legitimate way of applying them? Or does odin do something more in depth that is necessary
[Samsung Galaxy S8 Guides, News, & Discussion] partcyborg:
I am trying to put G950USQU1AQG4 on my s8 on VZW. My CSC is already VZW.

When I flash the AP as party of the root upgrade with moded odin, everything is fine, but when i apply the current CSC and userdata afterwards i wind up with a 10G /data partition, which is useless.

Does the fact that I have to use stock Odin matter? Can I flash these via flashfire?
[Samsung Galaxy S8 Guides, News, & Discussion] Mike15678:
[MENTION=6341304]Rally517[/MENTION] I believe that this is your firmware: http://updato.com/firmware-archive-select-model?record=32B351D171A811E7963AFA163EE8F90B for Boost Mobile. I have tested it myself and it seems fine. Enjoy!

P.S. fw.updato.com says it's an Australian firmware, but through my testing it seems like it's an American firmware. It also has the model number "SM-G950U" meaning it's American.
[Samsung Galaxy S8 Guides, News, & Discussion] Rally517:
I've seen that a few times but passed over it cause of that reason. Smh

---------- Post added at 09:34 PM ---------- Previous post was at 09:31 PM ----------

Last question. Have you tried different firmware? Do we have to change mms settings to get picture mail to work? I had to on the s7edge
[Samsung Galaxy S8 Guides, News, & Discussion] Mike15678:
What are you trying to do, exactly? Re-flash Boost Mobile firmware, flash unlocked firmware, or change carriers (change CSC code)?