yashsingh1/xdaforums huggingface dataset:
[Samsung Galaxy S8+ Guides, News, & Discussion] rebelduke:
Carrier ROM Switching

I'm a true beginner and this thread was very helpful to me. I’m hoping you’ll have the time to answer a question. I know the specific details are no applicable to my phone but I’m assuming the process is.

I have a Galaxy S10+ (SM-G975U with Baseband version G975USQU1ASD3) purchased

directly

from Samsung with an AT&T SIM card. I had AT&T send me the unlock code and my phone was SIM unlocked so that I can move to T-Mobile, which I've done successfully

My problem is that I'm on the T-Mobile network, but I still have all of the AT&T bloatware including the jingle and blue/white rotating globe on startup. I'd like to get a clean install of the T-Mobile ROM (U1) and remove all vestiges of AT&T. Is this possible? If so, can I do it in one step (move directly from T-Mobile SIM with AT&T ROM (SM-G975U) to T-Mobile SIM with T-Mobile ROM- SM-G975U1).

T-Mobile phone customer service and local store personnel say they understand my problem but that they can't help me since the phone is working fine.

Thank you.
[Samsung Galaxy S8+ Guides, News, & Discussion] xFilthyxJesusx:
I am going to attempt to use this guide to flash from SM-G955U (TMB) to SM-G955U1 (XAA).

Here is my current phone info:

Model: SM-G955U (Snapdragon)

One UI: 1.0

Baseband: G955USQU7DSL3

Bootloader: 7

Service provider SW ver: SAOMC_SM-G955U_OYN_TMB_PP_0026

98895a3739595a3653

TMB/XAA/TMB

I am in India and would like to use the India CSC, but do not see that as being possible right now. Will figure that out down the road if this is successful.

Flashing to SM-G955U1 (unbranded USA, snapdragon) (XAA)

The firmware I am flashing is newer firmware than currently instaled.

Model: SM-G955U1

OS: Pie(Android 9)

File Version: G955U1UES7DTB2/G955U1OYM7DTB2/G955U1UES7DTB2/G955U1UES7DTB2

BL ver : G955U1UES7DTB2

Bootloader: 7

AP Ver : G955U1UES7DTB2

CP Ver : G955U1UES7DTB2

CSC Ver : G955U1OYM7DTB2

Filename: SM-G955U1_1_20200131184615_sapzy2x6yh_fac.zip.enc4

Size: 3.502 GigaByte

LogicValue: joqo8w1r63us2fil

To future proof myself, should I possibly use the same firmware as currently installed?

IE: G955U1SQU7DSL3 instead of G955U1UES7DTB2 for SM-G995U1 | matching my current firmware G955USQU7DSL3 for SM-G995U

?

I need to head to public WiFi to download this file as it is 3.5Gb. If anyone sees any issues witht his please speak up before I begin the process. Don't want to have to purchase a new mobile if this messes up.
[Samsung Galaxy S8+ Guides, News, & Discussion] otkaz:
Do I need to do a carrier switch?

I've read the guide and a lot of the replies but I just want to make sure I'm understanding everything. I just purchased a S8+ from an individual that used it for a week with at&t(USA) 3 years ago and never used it again. I have TMobile(also USA). I was able to unlock it to work with my sim but it has 3 year old firmware. I want to update to the newest TMobile firmware so I can have WiFi calling. So, my understanding is I need to flash the stock firmware from TMobile using Odin, and then follow the carrier switch instructions in order to get the TMobile features to work? I just want to make sure I'm understanding this and doing everything in the correct order. I don't plan on using the unlocked firmware. Just want the most up to date TMobile stock room. Thanks in advance for any advice!
[Samsung Galaxy S8+ Guides, News, & Discussion] njdan30:
It should work by flashing the latest firmware for that phone as they're multi CSC. Not just there u1 firmware
[Samsung Galaxy S8+ Guides, News, & Discussion] ben00:
I wonder if anyone can help. This might not be correct forum.

I had an S8 (G950U1) that I purchased directly from Samsung US, and used in Canada with Bell Canada, for the last 2 years. As I only have a data plan, I always utilize the native SIP client, with the stock dialer (set up the settings using QuickShortcut Maker). I have recently purchased the S10e in Canada (G970W) and I have no luck it being able to make an SIP call using the dialer. All the settings the exact same. I assumed it had something do with the fact that it is the Canadian version. I flashed the U1 firmware, from Sammobile, on it, and it is now showing XAA/XAA/XAC under software. Still have no luck using the native SIP client. Does tips mean my phone is fully US version, or is it still the Canadian version, as the last / is XAC. Would it help to flash the combination files?

Can someone please help, or guide me? I rely on that feature. Thanks.
[Samsung Galaxy S8+ Guides, News, & Discussion] TheMadScientist:
Yea this is for s8 plus mate. Xaa is unlocked us firmware and I think xac was Sprint originally. I may be wrong. The first and second are what the device is. The third is what it was originally or vice versa. I'd post in the s8 threads might get more help I don't know about using sip account never tried
[Samsung Galaxy S8+ Guides, News, & Discussion] ben00:
Thanks for your response.

My question is not device specific.

I know, XAA is US carrier free, and XAC is Canada carrier free. That was precisely my question. What doestgt mean when the last section is XAC. I'm trying to make my phone completely US carrier free, as I assume, that's why the SIP client is not working.

So, if the last section is Canadian, what does that mean, and how can I make it be XAA/XAA/XAA. Thanks.
[Samsung Galaxy S8+ Guides, News, & Discussion] TheMadScientist:
One of the three. Can't remember which one. Will always be what the device was originally. Like I had a Xfinity s8. But unbranded it. It was xaa xaa cct nothing you can do to change that one.
[Samsung Galaxy S8+ Guides, News, & Discussion] JeffATL:
Does this still work on bootloader 7?
[Samsung Galaxy S8+ Guides, News, & Discussion] Ali Javed:
Hello, this guide looks really interesting.

I have an S6 Edge VERIZON variant, is it possible to carefully follow this guide and switch from VERIZON variant to an international ( UNLOCKED ) firmware where I get rid of all verizon bloat and that dreadful "sim card is not form verizon" or the occasionally "NO SIM" error?
[Samsung Galaxy S8+ Guides, News, & Discussion] dave678:
I bought an S8 Plus off Ebay that the seller says it's for Verizon but the firmware says it's from Xfinity. The listing pictures shows Verizon stuff on the phone. The firmware is G995USQU1AQK3. How would I go about updating it to the latest Nougat firmware without losing the Verizon stuff?
[Samsung Galaxy S8+ Guides, News, & Discussion] shaggyskunk:
I guess Flash the latest Firmware with Odin & then Flash the Verizon CSC.

Backup your device FIRST ⚠️ As you may need to Factory Reset changing the CSC?
[Samsung Galaxy S8+ Guides, News, & Discussion] untyped:
I am trying to flash my T-Mobile one to ATT. I was able to load the Factory Binary, restart using adb and ad the Canadian HOME_CSC for CSC, but it came with FAILED. On the phone it said cached failed. Not I can still load in to Factory Binary, but when I restart with ADB I get a message saying To use the Emergency recovery function on SmartSwitch ... HELP!
[Samsung Galaxy S8+ Guides, News, & Discussion] Mike15678:
You can try flashing the AT&T "USERDATA" file in the "UMS" box in Odin to get AT&T features, AFTER following the "Flashing Unlocked Firmware" section. I'm pretty sure you're able to uninstall the apps that install (due to flashing the "USERDATA" file.) Or you could just follow the "Flashing Standard Firmware" section.
[Samsung Galaxy S8+ Guides, News, & Discussion] Mike15678:
First of all, is your phone SIM unlocked by T-Mobile? Secondly, did you flash the Canadian "HOME_CSC" in Prince Comsy's Odin? Finally, I recommend that you follow the "Flashing Standard Firmware" section so you can get your phone functioning with the firmware you originally had before you followed this guide. Therefore, you can start the guide again, if desired.
[Samsung Galaxy S8+ Guides, News, & Discussion] untyped:
Yes, sim is unlocked.

Yes I did flash HOME_CSC with Prince Comsy's Odin.

The problem is I can not get it in Download mode....

On top of that using SmartSwitch trying to download firmware from Samsung gives me an error at about 70% saying that there is an error in the file...

What are my options?
[Samsung Galaxy S8+ Guides, News, & Discussion] untyped:
I was able to get back in the same situation again. I get fail after doing the Canadian FW and the HOME_CSC in the CSC box. The message on the phone says. "SECURE CHECK FAIL: cache".

I will attempt to download the FW again. It sounds like corrupted file.

EDIT: That's exactly what it was. the Canadian FW I had was corrupted.

Thanks !!!
[Samsung Galaxy S8+ Guides, News, & Discussion] Mike15678:
The failure of flashing the Canadian Firmware's "HOME_CSC" file shouldn't have hindered your ability to access Download Mode, but I'm glad you fixed your problem.
[Samsung Galaxy S8+ Guides, News, & Discussion] Sheon849:
After about a week of unlocking and flashing my Sprint s8+ to the unlocked firmware everything is running smoothly. Your guide was great bro thanks.

On a side note I stuck a Verizon sim in my phone and it started to put Verizon stuff on. Switched back to att and it did the reverse. Must be a unlocked feature of the phone. Still works great tho.
[Samsung Galaxy S8+ Guides, News, & Discussion] DruoGaby:
i now to am hopping on att with my sprint s8 plus..gonna buy it and jump ship..its unlocked..im using the att sim card but the same issues like you said..how does the unlocked version differ from the att besides the bloat ware..has wifi calling? video calling? hot spot?..im really diggin the att service..i bought a prepaid sim to check it out..im gonna go post paid
[Samsung Galaxy S8+ Guides, News, & Discussion] Sheon849:
I have zero issues at all it's running perfectly

I flashed the unlocked firmware so no Wi-Fi calling or video calling but I could care less to that. No bloatware is great. And phone runs perfectly.
[Samsung Galaxy S8+ Guides, News, & Discussion] DruoGaby:
thanks man!...i might need wifi calling because i travel..video not so much..lol..gonna give it a go..get off this sprint stuff!
[Samsung Galaxy S8+ Guides, News, & Discussion] Sheon849:
Sprint software is horrible so you wanna get off that asap.
[Samsung Galaxy S8+ Guides, News, & Discussion] Mike15678:
No problem. Enjoy!
[Samsung Galaxy S8+ Guides, News, & Discussion] Mike15678:
The unlocked firmware allows great versatility, in regards to switching bewtween carriers (if your SIM card is unlocked), and contains no bloatware, but doesn't have carrier specific features, such as the ones you listed.
[Samsung Galaxy S8+ Guides, News, & Discussion] Mike15678:
I'm glad my guide helped you. Enjoy!
[Samsung Galaxy S8+ Guides, News, & Discussion] DruoGaby:
thanks for the additional info man!..i guess whatsapp will work for wifi calls..lol

---------- Post added at 01:20 AM ---------- Previous post was at 01:19 AM ----------

question guys..upon flashing do i lose any pics n such..or should back up what i need..i rarely back up anything..but just asking
[Samsung Galaxy S8+ Guides, News, & Discussion] Sheon849:
Yes backup you lose everything.
[Samsung Galaxy S8+ Guides, News, & Discussion] DruoGaby:
thanks!..i have everything i need on my sd
[Samsung Galaxy S8+ Guides, News, & Discussion] Crazyfooljdm:
Need help unlocking carriers

I'm trying to switch from Verizon Wireless to Cricket. I bought this phone online and it was supposed to be unlocked however I believe it might be IMEI locked or something has it worked for a few days and then all of a sudden stopped working and locked my SIM card. Can anyone help me use this phone or did I just waste 500 bucks. It is an S8 Plus running US1 firmware last 4 digits aqdf
[Samsung Galaxy S8+ Guides, News, & Discussion] Mike15678:
Where did you buy it from?
[Samsung Galaxy S8+ Guides, News, & Discussion] DruoGaby:
ported to att from sprint...flashed unlocked rom..all good!..perfect!...signal bars and lte symbols are ugly tho...anyway to change them?
[Samsung Galaxy S8+ Guides, News, & Discussion] Mike15678:
There is no way, as it is part of the firmware. Unless, you have root, which is not available as of right now for the S8 and S8+.
[Samsung Galaxy S8+ Guides, News, & Discussion] Mike15678:
You probably got scammed. The phone must have been stolen and sold to you. The original owner of the phone must have called their carrier and reported that their phone was stolen, therefore the IMEI of the phone you bought became blacklisted. This is all speculation, so don't take my word for it. You should try contacting the seller (don't accuse them) and tell them that your phone became blacklisted. If they don't respond back, try getting support from the website you bought your phone. I can't help you.

P.S.: In general, if buying used electronics, find websites that offer buyer protection. It's always good to have.
[Samsung Galaxy S8+ Guides, News, & Discussion] AxlxA:
Quick question. I flashed from U1 to 955U AT&T, it's still on the April release. How do I get OTA updates to latest? If not, what's the best way of updating?
[Samsung Galaxy S8+ Guides, News, & Discussion] Mike15678:
First, make sure you have an AT&T SIM card. Then, go to the "Settings" app. Scroll down and tap on "About Device". Finally, scroll and tap on "Software update". The AT&T firmware from fw.updato.com is a bit outdated, but functional.
[Samsung Galaxy S8+ Guides, News, & Discussion] AxlxA:
Since my initial firmware flash didn't give me that UMS option, I decided to redo the whole phone again. I did the firmware carrier change steps first. Now i'm doing the standard firmware change. Still the UMS button is greyed out.... Any idea why?
[Samsung Galaxy S8+ Guides, News, & Discussion] Mike15678:
You didn't follow the "Prerequisites for anything you decide to do in this guide (Required)" section.
[Samsung Galaxy S8+ Guides, News, & Discussion] AxlxA:
You're right. Just updated the odin ini and button appears. Thanks. Latest AT&T firmware on updato website does not have the USERDATA file in its zip... I guess I'll try the original AT&T firmware and see if it'll OTA update from there.
[Samsung Galaxy S8+ Guides, News, & Discussion] Mike15678:
You're download was most likely corrupted. Try downloading the firmware again. All carrier variants have a "USERDATA" file. Only the Unlocked Firmware does not.
[Samsung Galaxy S8+ Guides, News, & Discussion] AxlxA:
http://updato.com/firmware-archive-select-model?record=6032047A52D711E7963AFA163EE8F90B

that's the one i downloaded. It contains no USERDATA file. Also it's 2.88gb
[Samsung Galaxy S8+ Guides, News, & Discussion] Mike15678:
Oh, that's the unlocked firmware with a CSC already set to "ATT".
[Samsung Galaxy S8+ Guides, News, & Discussion] AxlxA:
I found no way to update the AT&T firmware OTA on an unlocked s8+. I installed the AT&T april release with UMS userdata and all. After setting up the device, went to Software Update. And it gave me a "your software is already up to date" and shows me my current baseband. I even tried setting my date to a month later and tried updating again, still saying I'm at the latest (even though it was a MARCH security update). Yes I have AT&T sim that i used in my AT&T Galaxy S7 Edge SM-G935A so I know it's legit.

I grabbed the update files on the xda AT&T S8+ forum and did a adb sideload to update to the next iteration, still couldn't update through OTA. Flashed the remaining updates manually each time wiping the device. It got pretty annoying having to skip the set up 3x.

I'm currently on latest update through the files shared on the xda at&t subforum. I'm afraid this is the only method in the future to update with AT&T firmware.... =(:crying:
[Samsung Galaxy S8+ Guides, News, & Discussion] Mike15678:
Hmmm... That's strange. You're sure you followed the "Carrier Switching" section before flashing the AT&T firmware?
[Samsung Galaxy S8+ Guides, News, & Discussion] AxlxA:
yep, because the first time i posted few days ago, I didn't need to do carrier switching and already got ATT on the CSC so I ran the phone for a few days doing that. But today I decided to start off legit and followed your guide for carrier switching, enabled ATT in the adb echo, then followed the firmware loading guide using the userdata too.

I'm not sure but I'd like to hear from others who were successful at getting OTA updates when you flash to a carrier rom from the unlocked phone. I thought OTAs were also tied to the imei being a legit carrier imei too?

To get OTA from carrier?

1) carrier phone/IMEI?

2) carrier sim

3) no bootloader unlock or root?
[Samsung Galaxy S8+ Guides, News, & Discussion] Mike15678:
I've never heard of not being able to receive OTA updates, before. I recommend that you flash the unlocked S8+ firmware (by following the "Flashing Unlocked Firmware Section") and then once your phone gets fully setup, flash the AT&T "USERDATA" file in the "UMS" box in standard Odin. If you get an Odin fail, hold the buttons that allow you to enter Download Mode and try flashing the "USERDATA" file in Prince Comsy's Odin. You must patch the Prince Comsy version the same way you would patch standard Odin (instructions can be found in the prerequisites section) so you can gain access to the "UMS" box in Prince Comsy's Odin. FLASHING THE "USERDATA" FILE GIVES YOU CARRIER SPECIFIC APPS AND FEATURES.
[Samsung Galaxy S8+ Guides, News, & Discussion] gvmahesh:
Yes you are correct you do not get its updates I did the same like you and sideliad
[Samsung Galaxy S8+ Guides, News, & Discussion] Mike15678:
Weird... Maybe AT&T handles firmware updates a bit differently then the other carriers. I'll update the guide.
[Samsung Galaxy S8+ Guides, News, & Discussion] bcool15:
I dont see the ums file in the firmware package downloaded

http://updato.com/firmware-archive-select-model?record=55E89C7D4BED11E7963AFA163EE8F90B

tmobile USA

i keep getting in fail model odin 3.12.7

nvm found it, in one of the latest packages of tmb and it flashed straight up.
[Samsung Galaxy S8+ Guides, News, & Discussion] DruoGaby:
how often does the unlocked rom update?...and i had to manually install bixby voice..lol..was a cool lil process but it worked..asking about updates cuz im not trynna miss any..lol..i forget to look here alot!
[Samsung Galaxy S8+ Guides, News, & Discussion] Mike15678:
Re-download it, it's corrupted.
[Samsung Galaxy S8+ Guides, News, & Discussion] Mike15678:
The unlocked firmware gets updated pretty frequently. Almost on the same schedule as the other carriers.
[Samsung Galaxy S8+ Guides, News, & Discussion] DruoGaby:
alright...and no ota issues right..i should see it and be fine?
[Samsung Galaxy S8+ Guides, News, & Discussion] DruoGaby:
sprint got an update today for nav bar giding and lte roaming improvements...ending in QFJ..nothing on unlocked yet unless we have to update manually?
[Samsung Galaxy S8+ Guides, News, & Discussion] Mike15678:
Like I said, Samsung tries to keep up with other carriers for their unlocked firmware, but don't expect them to push an OTA immediately after one carrier pushes it.
[Samsung Galaxy S8+ Guides, News, & Discussion] DruoGaby:
i got you..and i appreciate your work man!
[Samsung Galaxy S8+ Guides, News, & Discussion] Androiddude101101:
I followed every step completly and flashed the tmobile version.

How can I know if I have 4x4 mimo and all tmobile features now?
[Samsung Galaxy S8+ Guides, News, & Discussion] MonsterAndroid:
I was wondering the same exact thing. I tried a few different things but none seemed to give me the results I wanted. I think it possible with root.

This was one of the main reasons I flashed my G950U1 to the T-Mobile variant G950U. 4x4 MIMO & 256 QAM. HD Voice and WIFI calling seems to work. Haven't checked VOLTE yet.
[Samsung Galaxy S8+ Guides, News, & Discussion] bcool15:
Two Sprint devices s8+

One flashed to Verizon Rom

Volte seems to not work i just tried it being on call tried surfing internet it stuck on loading until I disconnected call.

eventhough lte icon doesnt disappear as it should if no internet is connected

Can't send texts

I can receive texts and send mms only

(Picture)

Other device yet to test on T-Mobile Rom with Tmo sim

Since my sms has broken and no volte I'll try unlocked version Rom

My devices are sim unlocked, used eBay service...
[Samsung Galaxy S8+ Guides, News, & Discussion] Mike15678:
Did you first change your CSC to "VZW", before you followed the "Flashing Standard Firmware" section? You have to follow the "Carrier Switching" section, in order to change your CSC. And if that's not the issue, did you make sure that you flashed the "CSC" file instead of the "HOME_CSC" file in the "CSC" box and flash the "USERDATA" file in the "UMS" box in Odin, in addition to the other required files, if you followed the "Standard Firmware" section. And lastly, if this is a Verizon SIM card from another device, that won't work; you're going to have to follow: https://www.verizonwireless.com/bring-your-own-device/. If none of these suggestions work/help, try flashing the unlocked firmware by following the "Flashing Unlocked Firmware" section and then flash the Verizon "USERDATA" file in the "UMS" box to get access to Verizon features.
[Samsung Galaxy S8+ Guides, News, & Discussion] bcool15:
I followed the guide on page 1 post 1 to the letter, proudly ;)

Flashed unlocked version and everything so far VOLTE texts mms working good on Verizon's network

I have yet to test Tmo rom with its sim I'll post updates

Also if someone has z3x box I can show how to sim unlock for free sprint s8+ provided they offer free service later
[Samsung Galaxy S8+ Guides, News, & Discussion] komugi:
Will this break Knox?
[Samsung Galaxy S8+ Guides, News, & Discussion] Mr. Orange 645:
That is a common question, but no it will not. Knox is tripped only when you unlock the bootloader, root, amd/or flash Unofficial firmware.

This is all official firmware and does not require root or unlocked bootloader.
[Samsung Galaxy S8+ Guides, News, & Discussion] Duffmantp:
Did you find the UMS file for ATT? Thats what i was looking for. My CSC is already ATT but im looking to get VoLTE and Wifi Calling without ATT Bloatware. I was going to try just the flashing UMS file and not everything else.
[Samsung Galaxy S8+ Guides, News, & Discussion] SimplyNando:
Gonna try this out. I use my Verizon S8+ on T-Mobile mostly, but i go back and forth between SIMs. Thinking i should flash the T-Mobile Version
[Samsung Galaxy S8+ Guides, News, & Discussion] Mr. Orange 645:
A better solution might be to flash the XAA unlocked software. That way it's compatible with both carriers.
[Samsung Galaxy S8+ Guides, News, & Discussion] lasttwo:
Been trying to days to get tmobile firmware working on a sprint unlocked sprint phone. Tried the U and the U1,. It will not for anything register to tmobile network.

it is currently showing TMB/TMB/SPR under about device and CSC = TMB.

How do i revert this thing back to Sprint?? just re-do the carrier unlock section and change it back to SPR from TMB?
[Samsung Galaxy S8+ Guides, News, & Discussion] Mike15678:
The "UMS" file is the "USERDATA" file found in the firmware archive. If not present, then your download was corrupted and you would need to re-download it. If already on Unlocked Firmware, flash the "USERDATA" file in the "UMS" box in Odin to get access to carrier-specific features, such as Wifi Calling and VOLTE. I'm pretty sure you still get bloatware, though.
[Samsung Galaxy S8+ Guides, News, & Discussion] Mike15678:
To avoid confusion, you're not unlocking your phone's SIM card for use with other carriers when you follow the "Switching Carriers" section; if you want to switch carriers you must first be SIM-card unlocked through your carrier or a third party service. The "Switching Carriers" section only shows how you change the CSC code of your phone, in order to properly flash firmware of your choosing. Your CSC sequence: "TMB/TMB/SPR" is good, as the last three characters are permanently hard-wired onto your phone.

If you want to flash back, follow the "Carrier Switching" section to change your CSC code to "SPR" and then follow the "Flashing Standard Firmware" section.