yashsingh1/xdaforums huggingface dataset:
[Samsung Galaxy S8 Guides, News, & Discussion] Nexii5:
I finally did this last night. Ran into some issues that probably had resolutions posted in this thread but I managed to get everything working. I have a Verizon S8+ that I had converted to the unlocked version earlier but wanted to go over to T-Mobile for Video Calling and HD Voice.

I was fine up until I was flashing the T-Mobile firmware in the final step. I first tried with the PrinceComsy Odin but got a mismatch error. So then I tried with V3.12.7 and got the stuck at 32% error when the OS was installing but it still booted after I restarted. Things were a bit off though and it didn't go through the normal setup process. It didn't ask me for a Google Account or anything. It also had the alternate spellings to some words (colour instead of color, favourites instead of favorites). And I was missing the smart lock option. So I did a restore and after this everything was working fine and all options were present and the words were back to the spelling that I am used to.

I almost want to make a beginners guide based on this thread for beginners like me. I learned a lot along the way and some people might benefit from it. I'm not sure what the policy here is on making slightly revised guides with additional details etc...
[Samsung Galaxy S8 Guides, News, & Discussion] jcazes:
Hoping someone can help me. I'm stuck at step 13/14 - when I add the home_csc file to the CSC field in unmodded Odin, one of two things happen:

1. I get a "Fail! Sha256 is invalid" error in Odin's log

2. After resetting and closing out Odin to retry, the log gets to SetupConnection and hangs indefinitely.

Do you add the home_csc file to a fresh instance of unmodded odin 3.12.7, or should I be loading the Engboot to AP first and then adding home_csc to CSC?
[Samsung Galaxy S8 Guides, News, & Discussion] Gzan23:
I got the same error and just closed out odin and got out of of download mode (power+volume down+bixby). Then I opened a new instance of the PrinceComsy odin and just added the home_csc. Then went back into download mode, plugged in, and hit start and it worked.
[Samsung Galaxy S8 Guides, News, & Discussion] jcazes:
I just tried that and managed to get home csc to flash.

Unfortunately, after the reboot I keep getting error messages like "com.sec.epdg has stopped" and IMS Service has stopped.

I then tried rolling back to stock by flashing the AP + BL + CP + CSC_OYN from the stock TMobile firmware linked in this thread and in modded and unmodded Odin I get a "model dismatch" message. I also tried flashing JUST the AP in unmodded Odin and was able to get it to flash, but then the phone wouldn't leave the booting message. Can't seem to unbrick this thing. :(

Edit - success! At least success unbricking it. I was able to flash U1. I'm still sim locked to T-Mo so I'll try again later today.

Can anyone comment on whether you should be able to use modded Odin for every step, or is it important to use unmodded Odin for flashing Factory Binary? Just wondering what else I can safely try today.
[Samsung Galaxy S8 Guides, News, & Discussion] kberk001:
Please do!

I'm about to embark on changing a VZW S8+ to a T-Mobile one and am more than a little bit nervous. If you're able to list your simplified steps, I'd love to see them. And also to know whether yours seems to be working at full capacity now (working WiFi calling and all...)

Thanks in advance for any additional help!

K-
[Samsung Galaxy S8 Guides, News, & Discussion] Mr. Orange 645:
If this has been answered already, I apologize, but I can't find the answer and I've read threads until my eyes bled.

I have ordered the US Unlocked S8+ from samsung.com. I plan to use it on T-Mobile. If for some crazy reason, I decide I'd rather have a T-Mo version, can I use this method to flash the T-Mo firmware, essentially making my unlocked S8+ into a T-Mobile carrier version S8+?

I know you can change any carrier version into an unlocked version, but will it work in reverse? Anyone actually tried it? Not just reverted a carrier phone back, but actually started with an unlocked version and flashed carrier firmware?

Thanks in advance
[Samsung Galaxy S8 Guides, News, & Discussion] tengtengvn:
I think it works the other way around as well since the phones are the same. Having Video callings, RCS and other unique services are valid reasons so switch to carrier's firmware.
[Samsung Galaxy S8 Guides, News, & Discussion] Mr. Orange 645:
I THINK so too. Logically it SHOULD work both ways. But looking for someone who knows for a fact.
[Samsung Galaxy S8 Guides, News, & Discussion] xike17:
My apologies if this has been answered. I tried to skip flash Engboot since I didn't know how. But when I tried to flash HOME_CSC from G950W, I always received "FAIL! SHA256 is invalid." Can anyone tell me how do I flash Engboot? Do I need to unzip Engboot? Which files goes where in Odin? Thanks.

Update: Put Engroot to AP in modded Odin and it worked. However, when I tried to flash HOME_CSC from G950W in unmodded Odin, I still received the same error "FAIL! SHA256 is invalid." Please help. I need to return the phone to Samsung in the original Verizon firmware.
[Samsung Galaxy S8 Guides, News, & Discussion] xike17:
That's very thorough. Thanks! I finally flashed the Verizon G950U firmware. In Step 13, I also needed to use modded Odin instead of 3.12.7. Then in 24, I have to use unmodded Odin to get it work. I was also stuck at 32%. Boot the phone, saw the Verizon logo (at last!), waited for about five minutes at the Verizon logo, didn't know what's missing but reset anyway. Glad this is done.
[Samsung Galaxy S8 Guides, News, & Discussion] kberk001:
Amazing, thanks!

Here's the one question I have at a glance: Should the replacement for the G950W firmware (which is for the S8, not the S8+, I believe) be the T-mobile one (remember I'm coming from Verizon), the Canadian one (which I think this OP one is), or something else?

I got thrown off by the last 4 steps:

1. flash eng boot

2. adb shell

Code:

echo "TMB" > /efs/imei/mps_code.dat

change TMB to your desired carrier

3. restart phone

4. flash the new carrier firmware

...which seem to replace earlier steps 10, 12, 21, and 24. Is that right?

Again, thank you so much for all the effort in clarifying!

K-
[Samsung Galaxy S8 Guides, News, & Discussion] Markie0425:
Hi,

I'm here hoping someone might be able to help me resolve my issue. Ive been flashing my S8+ from G955U1 to TMobile. I have followed the steps and successfully able to switch my S8+ to TMobile, however my problem is the network. The device was unlocked (paid service) before the switch but even after inserting the SIM, the device just won't receive any data network. The access point is not defaulted to T-Mobile but i did marked that and still doesn't work. I've also tried going to network search and attempted to register T-Mobile but it failed to do so. I'm positive the SIM is not faulty as I am able to use it on my other Samsung phones.

How do you trouble shoot this? Thanks in advance.
[Samsung Galaxy S8 Guides, News, & Discussion] Nexii5:
Did it go through the normal phone setup process for you when it finally rebooted? For me it didn't. It didn't ask for my Google Account Name and password so I knew something was wrong. It also didn't ask many of the setup questions that it normally does. I could tell it was half baked. I also had some Canadian words in there (favourites instead of favorites). I was missing Smart Lock in particular. I think it halfway did the T-Mobile firmware so I was on the Canadian (G955-W) halfway and the G955U (T-Mobile) halfway. A restore had everything back though. Glad it helped!

For the replacement of G950W firmware, I used the G955W firmware for my S8+. I too was a bit confused by using the W firmware since I wasn't exactly sure what it was. When my phone finally booted after all this process, and was half baked like I mentioned above (missing some things and didn't go through the normal process) it had some Canadian way of spelling things so I'm thinking it was still stuck on the G955W firmware but with the T-Mobile boot logo. I have favourites spelled favorite for example. So I think it was a combo of the G955W firmware and the G955U T-Mobile firmware. I think the important firmware to get right is the one in step 24 or whatever. For me I used the G955U tmobile latest firmware.

I'm not positive about those final 4 steps you are referencing since I just stopped after step 25 but I think they are the steps to do if you want to switch carriers again easily. Like you want to go back to VZW now you would do that.
[Samsung Galaxy S8 Guides, News, & Discussion] xike17:
It did the first time before reset. Google signin, Samsung signin, carrier activation, and all that. I did the reset anyway just to make sure because I didn't want to spend any more time or effort to find out what's missing in the system. I powered if off at the first signin/setup screen after reset because I'm sending it back to Samsung.
[Samsung Galaxy S8 Guides, News, & Discussion] kberk001:
So, I'm on Step 17 and there isn't an XAC option. There's a bunch of other codes (it's on VZW still at the moment), then XAA and XAS, but no XAC.

Because I'm on a Verizon model trying to go to T-Mobile, I started with the Combo Factory Binary, then used the HOME_CSC from G955USQU1AQD9_Recovery_TMB. That wrong?

---------- Post added at 02:23 PM ---------- Previous post was at 02:17 PM ----------

Hmm... looking again, I wonder if it's because I flashed a G955U HOME_CSC instead of W. Lemme see if I can find the right one for the S8+. Stupid mistake, I suspect.

Oh good, SamMobile gonna take 5 hours to D/L. Damn. Haha.
[Samsung Galaxy S8 Guides, News, & Discussion] Nexii5:
Probably a long shot but did you scroll down? On mine I freaked out when I didn't see XAC immediately and then I scrolled down and it was at the bottom.
[Samsung Galaxy S8 Guides, News, & Discussion] kberk001:
Haha, I did, thanks, but yeah, not there. I think it was because I used the wrong HOME_CSC.

Would the right one be from the file G955WVLU1AQEJ ? Downloading that from Sammobile but as I said, it's gonna take a few hours, and I'm not even positive it's the right one. Seems this all kinda hinges on a Canadian firmware, even if you're on a US device and that's where I got confused.

If anyone has the ability to upload just the G955W HOME_CSC they used for their S8+, that'd be amazing, though I know it's asking a lot!

Thanks,

K-
[Samsung Galaxy S8 Guides, News, & Discussion] Nexii5:
Yeah I was a bit confused how/why the W firmware had to be used but I just followed the directions as closely as I could and saw what happened. I'd help you out but I'm at work.
[Samsung Galaxy S8 Guides, News, & Discussion] kberk001:
No worries, I'll wait it out. Just ~ 2 more hours now. I appreciate how much you've helped already!

K-
[Samsung Galaxy S8 Guides, News, & Discussion] Nexii5:
Here's where I got most of the files I used.

https://xdaforums.com/galaxy-s8+/how-to/carrier-switch-snapdragon-t3615680
[Samsung Galaxy S8 Guides, News, & Discussion] xike17:
This is the HOME_CSC extracted from G955W from here. Hope this helps.
[Samsung Galaxy S8 Guides, News, & Discussion] gvmahesh:
not able to get ota updates

Hi Thanks for the update. but i got vzw device flashed att userdata and all the files now i am not getting any ota updates. Any idea
[Samsung Galaxy S8 Guides, News, & Discussion] kberk001:
OK, so weird, after waiting and waiting for G955WVLU1AQEJ_G955WOYA1AQEJ_XAC to download for the HOME_CSC_OYA_G955WOYA1AQEJ_CL11449429_QB13673985_REV00_user_low_ship_MULTI_CERT.tar file, it finally did. Flashed it and still no XAC, its on VZW and has XAA and XAS, but no XAC. What the heck am I doing wrong? Should I start over?
[Samsung Galaxy S8 Guides, News, & Discussion] bxcovi:
Where can i get the Factory Binary, ENGBOOT, and stock odin for the 955u (verizon) i am trying to switch it to Tmobile and i would like to have WIFI calling, BAND 12 working. I have searched and the only search i found for factory binary shows a post that has the link deleted
[Samsung Galaxy S8 Guides, News, & Discussion] ali rizwan:
help please.

i just flashed my straightalk Galaxy s8 by using ODIN. which i bought today but i did not activate my phone with straighttalk before flashing it because i have AT&T service.

i am able to see AT&T logo on the left side screen and Signal bars on the right after flashing the device but i am not able to make calls.

As soon as i make a call it ends automatically.

im just wondering if i did something wrong during the process of flashing it

or do i need to activate the device first with straight talk and then switch the sim cards and it will work then. can you please help.
[Samsung Galaxy S8 Guides, News, & Discussion] bricky23:
If you look in settings, you will see that it has cdma and LTE only. No gsm. That's why no calls. You can flash 950w firmware, or 950u1 firmware, and it should work. I went through the process of changing the csc, because I wanted volte to work.

Edit: I should have asked, what did you flash?
[Samsung Galaxy S8 Guides, News, & Discussion] ali rizwan:
i am able to recieve and send text msgs but still not able to make calls.

in the mobile network settings i see NETWORK MODE as LTE/3g/2g( auto connect)

and network operators as AT&T.

i have flashed the firmware using SM-G930U_1 firmware .

can you please help me from here what am i doing wrong.?
[Samsung Galaxy S8 Guides, News, & Discussion] bricky23:
My phone is from straight talk. Which is tracfone. When I got it , it did the same as yours. The person that I bought it from used it on Verizon, and it worked perfectly. However on gsm carriers, no calls. I use cricket wireless (AT&T). I followed the directions in the 1st post. And changed the CSC from TFN to ATT. I was then able make calls. I then switched to AIO which is cricket, so that I could get volte. If you don't want to do all that, flash the sm-950W firmware. That for sure enables gsm. See if that works, then flash back. Make sure to use non-home csc file when flashing. It will wipe your phone!

Edit: It's been a while since I was on the U1 firmware, but when you put your sim card in the phone, doesn't it come up with a picture of a sim card, and then reboot with the correct settings for your carrier? Also if you click on the Lte/3g/2g auto does it give you other options? Also you did flash the SM-950U1 and not the SM-930U1 that you stated above correct? 930 = S7
[Samsung Galaxy S8 Guides, News, & Discussion] ali rizwan:
yes highly appreciated it worked.... thank you
[Samsung Galaxy S8 Guides, News, & Discussion] Poli169:
Once i open modded odin do i extract the engboot or on what box do i put it? New to this flashing and want to make sure i flash this file correctly. I see BL AP CP CSC would it be on any of these or where do i put the zip file. Thank you.
[Samsung Galaxy S8 Guides, News, & Discussion] gvmahesh:
Just add the engboot to BL and start
[Samsung Galaxy S8 Guides, News, & Discussion] gotojanoo:
Wondering if any one flashed US unlocked version to T-mobile ?
[Samsung Galaxy S8 Guides, News, & Discussion] elliwigy:
loool.. it has been flashed on every US carrier s8/s8+ i am sure thousands of times now
[Samsung Galaxy S8 Guides, News, & Discussion] gotojanoo:
delete

---------- Post added at 06:16 PM ---------- Previous post was at 06:11 PM ----------

Is it okay to flash CP,AP, CSC straight from firmware file or ENG boot must needed. I thought US unlock version has already TMB CSC in it?

After all process will it be still official in about phone or it will trip knox?
[Samsung Galaxy S8 Guides, News, & Discussion] elliwigy:
lol.. srry but i have to laugh.. you can read over 500 posts probably by now..

it wont trip knox because its official firmware...

every fitmware for US carriers has multi csc so it doesnt matter which one you use...

and you will either use regular odin or prince comsey odin
[Samsung Galaxy S8 Guides, News, & Discussion] gotojanoo:
Thanks Elliwigy,

I just got s8 plus unlocked and i was exited to flash tmobile firmware. Its been long time i haven't flash anything. I love samsung pay so i dont wanna miss that feature due to knox trip. I was just confirming. Still reading all thread related to carrier change . Lol it takes long for me to understand how this stuff works. May be age related lol. But thanks again.
[Samsung Galaxy S8 Guides, News, & Discussion] louisd:
So I went from AT&T to TMB and the ROM installed fine. Video Calling, wifi calling, VoLTE all working BUT multi-line (digits support) doesn't show. After a bunch of time with TMO support, they refuse to go any further because IMEI not an original TMO IMEI. Anyone gotten multi-line to work?
[Samsung Galaxy S8 Guides, News, & Discussion] PURESKILLZZZ:
GOOD WORK
[Samsung Galaxy S8 Guides, News, & Discussion] haines001:
Ok I'm Kinda new to all this, most of it seems strait forward. Except the files in step 1

-Download Factory Binary, EngBoot, and the G950W firmware.

I am switching a Verizon phone to cricket, I've seen many stock firmware non have AIO Listed, just want to make sure I have the correct file for cricket before I do this.
[Samsung Galaxy S8 Guides, News, & Discussion] fever308:
Can I do this to use my Sprint S8 in europe while I travel?
[Samsung Galaxy S8 Guides, News, & Discussion] y2whisper:
The same has happened to me on rogers in canada (except no VoLTE etc)

I believe IMS registration is required to fix this as its not registered on my device.

Anyone know of a way to force this? on a Pixel it was in the hidden *#*#4636#*#* menu
[Samsung Galaxy S8 Guides, News, & Discussion] louisd:
No IMS registration issues here, that's why VoLTE is working. That's not it.
[Samsung Galaxy S8 Guides, News, & Discussion] ahqball:
Is there anyway to do this on mac?
[Samsung Galaxy S8 Guides, News, & Discussion] orthosprime:
Thank you to kber001 for prompting a very helpful post by Nexii5! Every glitch he encountered I did as well which was comforting since I, too, switched from VZ to TM. Being somewhat of a novice at this, I don't think I would have attempted it without his clarifying notes (see page 52, post 515). Had I done so, I probably would have panicked when step 13 failed using Odin (unmodded). Same with step 24 when my phone choked at 32%. His corrective actions on both of those was super helpful. I also really appreciated his comments about why G950W is used as well as his remark about using the "COMBINATION" firmware for the factory binary which helped me locate it. It would be nice if the OP was updated with Nexii5's notes. It would have saved a lot of us having to read 51 pages of postings to get to his. All the same, I am tremendous grateful to the OP juvemex for all his hard work figuring out how to make the switch and telling the rest of us who are enjoying the fruit of his labor.

Thank you both for a job well done!
[Samsung Galaxy S8 Guides, News, & Discussion] duraaraa:
Possible to flash US firmware on Snapdragon Dual sim HK model?
[Samsung Galaxy S8 Guides, News, & Discussion] elliwigy:
Pretty sure you need to have it unlocked already to use on any other carrier

---------- Post added at 09:04 AM ---------- Previous post was at 09:02 AM ----------

Seeing as how they're 2 different devices I'd say no lol. And to add I tried flashing G9500 firmware on my G950U and it failed lol

So doubt it'd work.. if you have an unlocked bootloader that's another story.. you might end in a brick
[Samsung Galaxy S8 Guides, News, & Discussion] duraaraa:
Yeah, I was thinking with an unlocked bootloader. I think at least with Exynos S7, it's possible to flash any other Exynos firmware if you have unlocked BL, and it won't brick. But I don't want to try first.
[Samsung Galaxy S8 Guides, News, & Discussion] elliwigy:
Glad you got it working. I am not sure why there's so many steps lol. Is there a reason people are doing all the steps? I've gone back to Verizon simply flashing the U firmware then carrier specific userdata
[Samsung Galaxy S8 Guides, News, & Discussion] ahqball:
sorry have searched within this thread, has anyone successfully done this on a UK based S8? im from O2, now wanting to use t-mobile in NYC...
[Samsung Galaxy S8 Guides, News, & Discussion] elliwigy:
isnt the uk model on Exynos?
[Samsung Galaxy S8 Guides, News, & Discussion] grajasekar:
Read through a lot of pages, and I thought I found the answer somewhere a few days ago.... but I can't anymore :|

Does anyone know if I can take the S8+ from Unlocked U1 to T-Mobile firmware (minus the bloat) without resetting the phone / losing all my apps and data all over again?
[Samsung Galaxy S8 Guides, News, & Discussion] gqukyo:
Don't believe so, switching between firmware especially different carrier ones would definitely erase app data. Probably won't erase your other folders though.
[Samsung Galaxy S8 Guides, News, & Discussion] tommyg562000:
https://xdaforums.com/tmobile-galaxy-s8+/how-to/galaxy-s8-xaa-version-live-t3613013/page25

That guide seems to do the same thing as this or am I missing something? I'm not trying to devalue the OP or this post, I'm just trying to find out if they are accomplishing the same thing.
[Samsung Galaxy S8 Guides, News, & Discussion] ahqball:
I'm not sure mate... I've been away from this mobile tinkering scene for a while (as you can gauge from my signature haha), so have not kept up to date with what Exynos is and what it entails.

I'm only looking into these forums again as I've moved from London to New York, however O2 won't unlock the phone for me so wanted to look at other means so I can use my T-Mobile sim.

Actually, I read another thread, I do believe it's Exynos.
[Samsung Galaxy S8 Guides, News, & Discussion] elliwigy:
well if they wont unlock it then this thread wont unlock it either but it also wont work because you have exynos and the usa variants are snapdragon so they are different chipsets.. i suggest looking in threads for your device as you should be able to unlock it including the bootloader and do a lot more i am sure than we can lol

---------- Post added at 12:50 AM ---------- Previous post was at 12:48 AM ----------

yes, but we have snapdragon as do you lol but dunno if it works the same to be honest.. even tho they are both snapdragon ours are not dual sim
[Samsung Galaxy S8 Guides, News, & Discussion] mrdosback:
Stuck on step 9

I am here:

9. One the phone reboots run the ADB command, adb reboot bootloader

And the phone shows a screen with the Model Number SM0g950U SS

Version info and Device Info.

I am not sure how to run ADB command and adb reboot bootloader.

On step 10, what is the modded Odin, and do I flash ENgBoot in AP
[Samsung Galaxy S8 Guides, News, & Discussion] Vell123:
I have a question then. I have a unlocked s8 G950U1 currently on its factory unlocked software AQE3. I want tmobile's video chat, rcs (rich communications service) etc. but i dont want the bloatware and or the stupid splashscreen. Does anyone know how I can do this?
[Samsung Galaxy S8 Guides, News, & Discussion] joho5:
I just bought a dual SIM international s8. I live in America. What firmware do I need to have or try to obtain? Do I need to change my csc?
[Samsung Galaxy S8 Guides, News, & Discussion] Vell123:
more than likely the same firmware as everyone else
[Samsung Galaxy S8 Guides, News, & Discussion] joho5:
Yea but for the international one they don't have an American labelled one....all other countries. Which do I need to choose say if I wanted to restore to stock.
[Samsung Galaxy S8 Guides, News, & Discussion] bboii86:
where can you download the factory binary for the s8 plus?
[Samsung Galaxy S8 Guides, News, & Discussion] ldmelo:
Could this be used to unlock a virgin mobile S8?... I am traveling abroad and it would be nice to use the phone on other carrier during vacations.
[Samsung Galaxy S8 Guides, News, & Discussion] elliwigy:
it doesnt unlock anything so noyou must unlock your phone the normal way
[Samsung Galaxy S8 Guides, News, & Discussion] ivarraknas:
Can someone please provide information fora t-mobile to sprint firmware switch. I currently have a t-mobile s8 and I want to use it with sprint. Does the same procedure apply? Please share the links for all the required files.