yashsingh1/xdaforums huggingface dataset:
[Samsung Galaxy S21+] zenlifexxa:
Thanks, iBowToAndroid!

If I can revert the Tmo firmware version back to G996USQS4BUKK (released on 1/6/2022), I should be able to flash G996U1UES4BULE w/o successfully, correct? If this is correct, what version of Odin should I use? Thanks again!

ref: https://www.sammobile.com/samsung/galaxy-s21-plus/firmware/SM-G996U/TMB/#SM-G996U
[Samsung Galaxy S21+] iBowToAndroid:
If it were possible to revert, then yes, you could flash bootloader 4 version of U1 firmware.

But you can never revert bootloader versions, once updated. You cannot revert back to bootloader 4 of U firmware for the same reason that you cannot flash bootloader 4 of U1 firmware
[Samsung Galaxy S21+] zenlifexxa:
Gotcha, Thanks!
[Samsung Galaxy S21+] notJimz:
Hi there. I just got a used s21+ SM-G996U with ATT software.

My phone is stuck at Feb 2021 build and security patch.

RP1A.200720.012.G996USQU1AUAG.

What is the best working way for me to do to get the updates since I live in Malaysia.
[Samsung Galaxy S21+] iBowToAndroid:
1. Download firmware

2. Extract firmware

3. Put phone in Download mode and connect to PC

4. Flash

There are MANY how-to guides here on XDA if you've never done it before
[Samsung Galaxy S21+] notJimz:
Thanks for the tips.

Im already getting the hang for the flashing.

It's the files that made me confused.

My phone is BL V1 - G996USQU1AUAG

I am planning to flash the U1 firmware.

But from Frija, SM-G996U1 - CSC: XAA, the file is already at BL V4.

Or should I use your files : TL1-1-11.0?
[Samsung Galaxy S21+] iBowToAndroid:
That depends on whether you want to stay on BLV1, or update. The choice is yours
[Samsung Galaxy S21+] notJimz:
Thanks for the guide and your responds.

I managed to flash and convert U to U1.

Now my S21+ is on XAA and can receive the OTA updates.
[Samsung Galaxy S21+] Jaegerx:
How did you do it? This is my very first time and I'm kinda scared to do it. Can you help me? I have a SM-G996U and I want to change it to U1.
[Samsung Galaxy S21+] Jaegerx:
Did you manage to do it?
[Samsung Galaxy S21+] Midwest620:
Hey Yall

Sorry for the question but I am a longtime lurker here and have learned a lot but I think I am still in the noob zone so don't hate on me please, also if this is in the wrong spot please direct me and I will post it in the correct area. I have used Odin in the past several times but this time it has me stumped. I have a T-Mobile Samsung Galaxy 21+, I am attempting to flash it to a U1 Firmware that is available on this thread on the first post. However I have attempted to do this several times and I keep getting the Fail! (Auth) Error. I am including the Odin screen and the phone screen. Any and all help would be appreciated!!!!!
[Samsung Galaxy S21+] VADEROUS:
Hi. I want to Flash Firmware updates for Android 12 on my G996U. Problem is, I am not sure on my CSC.

"SM-G996U_OYN_XAA_RR_/0003XAA/XAA/ATT" is my CSC AT&T or XAA? On Smart Switch it is XAA. but on download mode carrier ID is ATT. Please help. So I can get correct firmware. I cannot get OTA here in the Philippines. Thank you
[Samsung Galaxy S21+] iBowToAndroid:
You can flash any G996U firmware - it doesn't matter which one you choose
[Samsung Galaxy S21+] VADEROUS:
Even if my CSC is ATT i can flash G996U XAA? Is it safe?
[Samsung Galaxy S21+] VADEROUS:
"Also, U firmware is identical for the 4 base files (AP, BL, CP, CSC) for each individual build, no matter which carrier it comes from. So if you download 2 different carrier versions of the exact same build, the 4 base files will be identical" is this for the firmware you uploaded only? or I can get latest firmware of G996U on Sammobile.?
[Samsung Galaxy S21+] iBowToAndroid:
There is no such thing as "G996U XAA"

XAA belongs to G996U1, not G996U
[Samsung Galaxy S21+] VADEROUS:
Oh. Okay. So my CSC is ATT then? I will flash G996U1 ATT for Android 12. Thanks.
[Samsung Galaxy S21+] VADEROUS:
BTW. If I'm to to flash firmware to Android 12. SHould I first flash the pre requisite updates beyond Security Patch Level May 1, 2021? (that was the last update my phone had) or I can go straight to the latest update on Android 12 say Jan 2022. Thank you
[Samsung Galaxy S21+] iBowToAndroid:
You can go straight to whatever version you want to be running
[Samsung Galaxy S21+] VADEROUS:
Thanks. But I can't seem to find firmware for G996U w/ CSC of ATT. Can I flash Firmware for G996U1 w/ ATT or XAA to a G996U phone? I download firmware from Sammobile and Frija for Android 12. BTW if Im outside USA should I opt for XAA rather than ATT since my network is not ATT here in my country?
[Samsung Galaxy S21+] iBowToAndroid:
Flash G996U1 XAA
[Samsung Galaxy S21+] VADEROUS:
I completed the flash on ODIN (Flash is correct IMO because it was "PASS" and there were no error on the logs of ODIN).

BUT there is this error on my phone "partition abl Reason avb_slot_verify.c:256: ERROR: abl: Hash of data does not match digest of decriptor. (2nd)"

I used G996U1 XAA. PLEASE HELP. PHONE JUST STUCK ON BLUE SCREEN CANT EVEN REBOOT

NMV it worked now. had to download another firmware from frija then flash it again it's all good now. THANKS A LOT! (Initial file is from Sammobile)
[Samsung Galaxy S21+] yygemmi770:
I have ones that are stuck to VZW/VZW/VZW with U1 package flashed. Any resolution?
[Samsung Galaxy S21+] x1tymez:
Nope. It's how they're doing it, when flashing firmware.
[Samsung Galaxy S21+] skeamznz:
Hi, I am from New Zealand and my better half has purchased a like new S21+. It has verizon branding and the update download speeds are very slow. The phone is currently on the october 21 patch. Am I correct in thinking I can just odin flash the newest U1 XAA firmware to remove the carrier branding? Is it alright to flash straight to the newest CVC4 XAA firmware?
[Samsung Galaxy S21+] yygemmi770:
You could flash a U1 package that will remove the carrier bloat. It is best to match the same bit when flashing, you can flash up, but not down.
[Samsung Galaxy S21+] iBowToAndroid:
As long as you've verified that the phone is SIM unlocked, yes
[Samsung Galaxy S21+] skeamznz:
I assume it is unlocked as her NZ sim is working perfectly. We do not have locked phones in NZ is there an easy way to check this? Appreciate the help.
[Samsung Galaxy S21+] iBowToAndroid:
It doesn't matter what the policy is for NZ phones, as this is not an NZ phone.

If her SIM is working perfectly, then the phone is already SIM unlocked
[Samsung Galaxy S21+] Asif sami:
I recently bought s21 plus from a local shop . It is usa variant . Using it in Bangladesh with my country sim card and it is working but i am not receiving software update as i should , why ? . After buying the given pictures are remaining constant . Will i not be able to receive ota software updates ?
[Samsung Galaxy S21+] Asif sami:
Help please
[Samsung Galaxy S21+] iBowToAndroid:
You might get OTAs if you flash to U1 firmware
[Samsung Galaxy S21+] Asif sami:
Oh :(
[Samsung Galaxy S21+] Asif sami:
I am not receiving any software update . Can anyone explain why ? And what is gcf /gcf, gcf /non ? Which country carrier code this is ? As given in the screenshot . Local shop from which i bought , telling me to wait more for update where as i am already 6 months behind from update .what to do ?
[Samsung Galaxy S21+] iBowToAndroid:
Just manually flash the latest version
[Samsung Galaxy S21+] ur31337:
I haven't been on these forums in many many years, but the recent updates causing my earpiece speaker to cutout during calls is making for a useless talking experience. iBowToAndroid, thank you for your detailed information here. I am getting my brain back in shape to go through the flashing process.
[Samsung Galaxy S21+] virtual_law:
Switched from AT&T firmware (Jan '21 build) to U1 via Odin, all thanks to this thread! Just wanted to give a thanks to the op for leaving it out there for us!!

P.S I was on OneUI 3.0 before and was only showing Single Sim and wasn't getting any update notifications either. Flashed U1, instantly was prompted for available updates. Couple of downloads and installs later, I got OneUI 4, and eSIM also showed up. Leaving this here to help anyone in a similar situation!
[Samsung Galaxy S21+] arjean:
Anyone have the beta file for one ui 5?
[Samsung Galaxy S21+] CompuTechnoPro™:
I got a T-mobile S21+ 5G, I did flash the latest U firmware of TMB but, eSIM got disabled😥
[Samsung Galaxy S21+] CompuTechnoPro™:
Which CSC file did you flash? CSC or HOME_CSC? Did you flash USERDATA file as well?
[Samsung Galaxy S21+] iBowToAndroid:
USERDATA goes with U firmware, not U1 firmware
[Samsung Galaxy S21+] CompuTechnoPro™:
Does converting from U TMB to U1 XAA (to get OTA and eSIM functionalities) require CSC or HOME_CSC file to be flashed?

Update:

I've flashed U1 XAA and eSIM works now. OTA updates work as well!😁

Pro tip: You can only select Network mode for the primary SIM when eSIM and a physical SIM are enabled. To bypass this dial *#*#4636#*#*, select the appropriate SIM, and change the corresponding Network mode to your choice!
[Samsung Galaxy S21+] PatatePwel:
Is it possible to convert a SM-G996W (Canadian version) to U1 firmware? My current model (or firmware) should have eSim capability (it does have an eSim IMEI), but I can never get it to work. Would U1 firmware unlock eSim capability? [the phone itself is carrier unlocked]
[Samsung Galaxy S21+] iBowToAndroid:
If you have One UI 4.0 or higher, you should be able to flash HOME_CSC to avoid factory reset. But you have to make sure you're not flashing a lower security patch than what the device has already

Yep. But U1 may not have all Canadian bands enabled, so if network performance degrades, that's probably why
[Samsung Galaxy S21+] Turbanator911:
Hey, first post so sorry if I say anything off lol.

I have a G996U purchased from Verizon that I flashed to U1 firmware like 2 years ago when I first got it, and have had no issues since. I had a OTA software update the other night that seems to have triggered a carrier lock in my phone. The phone works fine for 5 minutes, then I get a popup telling me the phone is locked and to contact Verizon, despite the phone being from Verizon and running a Verizon sim. I went to them and unfortunately nothing they did could resolve it (new SIM, eSIM, etc), so they shipped me a new phone via insurance. I'm wondering though if I could save myself the hassle of transferring everything and do an in-place flash on the phone to see if that clears up the issue. I am already on the newest firmware (G996U1UEU5EWB1), so I can't upgrade, but I was wondering if I'd be able to flash the same firmware already on the phone while keeping all my data. Thanks.
[Samsung Galaxy S21+] iBowToAndroid:
Yep just use HOME CSC
[Samsung Galaxy S21+] Turbanator911:
Thank you, just also want to ask bc I'm actually not sure which software to go for. I thought I had flashed XAA long ago, and I'm definitely on U1 firmware, but when I check "Service provider software version" in settings, it says VZW rather than XAA. Is it safe to download XAA firmware for a reflash or should I just do VZW to be safe?
[Samsung Galaxy S21+] iBowToAndroid:
If you download the same version of U1 XAA and U1 VZW, extract them and compare the files, you'll see that they're identical. So therefore it doesn't matter
[Samsung Galaxy S21+] PatatePwel:
How do you make sure you don't flash a lower security patch?
[Samsung Galaxy S7 Edge Questions and Answers] brunover:
Hello, today after failing to install LineageOS on my Samsung S7 Edge I wanted to wipe the phone to try again. In doing this though, i fricked something up which causes the following error: Failed to mount '/data' (Device or resource busy). When I plug my phone into my pc, it recognizes it but doesn't see a partition. Does anybody know how to fix this?

(Sorry if this is not the right thread for this questions, it's my first time posting something on here.)
[Huawei Mate 30 Pro Questions & Answers] Avia3:
I can't change my screen resolution and toggle smart resolution...

Help appreciated
[Razer Phone 2 Questions & Answers] TechX1991:
I've checked my build.prop and all that... Says Phone 2 and such, but my settings says Pixel 2 XL. Followed a tutorial to root it from here but didn't notice it was pixel 2 XL before I did it
[Razer Phone 2 Questions & Answers] RogerF81:
Any mods installed? If not, then this is really funny :D
[Razer Phone 2 Questions & Answers] TechX1991:
Only magisk module is viper4android lol literally that's it
[Razer Phone 2 Questions & Answers] RogerF81:
Very interesting then :D Viper4Android shouldn't trigger that
[Razer Phone 2 Questions & Answers] TechX1991:
Reset everything, redid my root and all that, installed viper and its fine now lol
[OnePlus 7T Guides, News, & Discussion] ej8989:
Fingerprint works faster when animation effect is off.

To set:

Settings > Security & Lock Screen > Fingerprint Unlock > Fingerprint animation effect > None
[Touch Diamond, MDA Compact IV General] papalazarou:
Hey,

I'm wondering if someone can give me the default settings for the internet tab header? Mine was branded, and by creating custom XML for it I've removed the branding and replaced it with my own preferences, but I'd like the default "Launch Browser" image. (big pic of a glowing globe dealie)

Can anyone give me the path?

Cheers in advance.
[Samsung Galaxy S21 Ultra] Polishow:
Flashing the U1 right away when my Devices arrives :geek:
[Samsung Galaxy S21 Ultra] iBowToAndroid:
That's why I post it :)

That, and so that anyone interested can dig through the firmware for anything interesting.

I'm uploading in order of model number, so Ultra is last unfortunately - and my upload speed is only 10 Mbps. Should be up in the next few hours though
[Samsung Galaxy S21 Ultra] iBowToAndroid:
Initial U firmware and AT&T USERDATA are posted, along with U1 firmware. U firmware is not yet accessible in the firmware download tools like SamFirm and Frija, but if anyone wants a different carrier's USERDATA (for flashing bloatware to a U1 device or for converting a U device from one carrier's bloatware to a different one), let me know and I'll get it for you
[Samsung Galaxy S21 Ultra] -Zork-:
Are anyone know if Is the version SM-998U or SM-998U1 have or not dual SIM?
[Samsung Galaxy S21 Ultra] jcrompton:
Thanks for doing this ! My phone arrives Wed and of course I wanna flash the U Home CSC to my unlocked U1 device so I can get the AT&T calling features. Are the ones you've uploaded the latest firmwares?

And thanks again for always taking time to do this!!!
[Samsung Galaxy S21 Ultra] crowax:
Sorry for the possible silly question, but I am coming back to the Galaxy after 4 years on the Pixel and haven't been flashing for a while.

I am getting an Ultra from T-Mobile. If I flash the U1 (to remove the bloat) and then follow the instructions above, it says it will put the carrier files on there. Will that just put the bloat back on? I guess I was wondering if it would make it "stock" going forward. I just wanted to figure that out before I set the phone up since it requires a factory reset. Thanks!
[Samsung Galaxy S21 Ultra] iBowToAndroid:
No, that's not what it says - I think you're mis-reading. Flashing U1 removes bloat, period. If you want the bloat gone, you have no need to do anything else other than simply flashing U1 firmware
[Samsung Galaxy S21 Ultra] crowax:
Oh perfect. I checked again after your post and my confusion was at

"the correct procedure for switching from one carrier's firmware to another is". I was thinking it was the procedure to switch from a carrier firmware to any other firmware including U1. So the re-adding of the carrier files didn't make sense.

Thank you very much for your quick answer!
[Samsung Galaxy S21 Ultra] bANONYMOUS:
OP Requested my linked deleted
[Samsung Galaxy S21 Ultra] iBowToAndroid:
Go create your own thread if you're going to post links other than the ones in my OP
[Samsung Galaxy S21 Ultra] bANONYMOUS:
I do have my own thread about these firmwares, I was just including the Canadian bloat free firmware because you only have the US firmwares. The links are to samfw because they update them regularly so people can get the latest releases where as your links are the current version you linked so if you don't update them then they'll be out of date versions. Do you get paid from your Android File Host links or something? What's the issue? No need to be hostile, just trying to help provide information

EDIT:

Also, when you're flashing between different carrier firmware's, you should only use CSC and not HOME_CSC because keeping the user data sometimes includes the bloat apps preinstalled.

The rule of thumb is if you're CHANGING anything, start fresh with CSC

If you're UPDATING from the same carrier firmware to a newer version, use HOME_CSC.

So for anyone using this guide, it's not recommended to use HOME_CSC when converting over to the bloat free firmware as it's a different carrier release. Not saying it won't work, it's just not recommended, almost like a dirty flash so it could cause stability issues down the road after a few OTA's or something.
[Samsung Galaxy S21 Ultra] iBowToAndroid:
XAC is for model G998W. The title of this thread makes it clear that this is only for models G998U and G998U1. So kindly delete your posts, and keep them in your own thread
[Samsung Galaxy S21 Ultra] bANONYMOUS:
Okay, post deleted, but it's probably worth noting that you don't know what the G998W is. Because it's the same phone as the U and U1. During the One UI 3.0 Beta on the S20 Ultra, I flashed G988U on my G988W, and when the beta continued onto the U1, I flashed those firmware files as well. The Canadian S20/S21 is just a non branded T-Mobile with more supported radio bands in the firmware.

If you actually look at the carrier info for the S20 Unlocked U/U1/W firmware, they all say XAC and XAA at the bottom no matter whether it's U/U1/W. They are all the same phone and Samsung even uses the same firmware merged, just different radio bands, and because Canadian radio bands support ALL bands, it makes the W firmware the a merge of both U and U1, so it's actually the better choice from what you have posted because it supports every U/U1/W the best. So your post is relevant to the W models whether you want to accept it or not.

That's why I included a link to the firmware, because it's the same device, same flashing process, completely same procedure, so this thread IS relevant to the W models even if you said U and U1 only, the W is also included in that even if you didn't say it was, doesn't make it true.

Also the only difference between U and U1 is U is unlocked but INCLUDES carrier bloat, U1 is unlocked and has NO carrier bloat.

So, closing info here.

U1 is unlocked, no carrier bloat, US radio bands

U is unlocked, HAS carrier bloat, US radio bands

W is unlocked, no carrier bloat, ALL radio bands

You just need to make sure it's the SM-G998W for AXC and it's the best choice with no bloat.

Just because you clearly didn't know this about the W phones, doesn't mean you gotta get all snappy, I'm just trying to help the community.
[Samsung Galaxy S21 Ultra] iBowToAndroid:
I'm absolutely very well aware of what W models are. Thanks.
[Samsung Galaxy S21 Ultra] bANONYMOUS:
Then why are you mad I included it when it's the same device? I don't get why you're being salty about it. I'm just trying to help out.
[Samsung Galaxy S21 Ultra] iBowToAndroid:
1. Not mad at all

2. It's the same device internally, yes. But this thread is about software - not hardware. And the software being discussed is the USA firmware, not the Canadian firmware.
[Samsung Galaxy S21 Ultra] alfredtv:
sorry I've also been out of the firmware game for a while too. I have a U1 from Samsung unlocked S21 Ultra and need to put the ATT carrier firmware on it. If I'm reading this right, I'm using Odin and flashing the XAA U1 firmware without a sim, when it reboots and reads updated SIM carrier setting at reboot then I am shutting it down and immediately attempting to install the ATT U1 firmware (all BL, AP, CP, CSC (non HOME CSC)? I don't see where I would select USERDATA but I need the ATT options (was going to exchange it but I got all the incentives)
[Samsung Galaxy S21 Ultra] iBowToAndroid:
1. If your phone is already running U1 firmware, there's no need to flash it again

2. If you don't see the USERDATA slot, you have a very old version of Odin
[Samsung Galaxy S21 Ultra] alfredtv:
It is running U1 but I need the ATT bloatware.....I'm on FirstNet and the only way it will connect correctly is if it's running the ATT built in config files. So I'm trying to go from clean to dirty!!
[Android Q&A, Help & Troubleshooting] riky67:
if i have a rooted android 5.1 box and i want to disable root (to use netflix or disney cannel etc etc), is there a generic way to disable root ???
[Android Q&A, Help & Troubleshooting] Deleted member 1890170:
IMO the cleanest solution is to re-flash box's Stock ROM.
[Android Q&A, Help & Troubleshooting] riky67:
Version stock 4.1

with 5.1 video streaming app not work or not show in playstore

help me??
[Android Q&A, Help & Troubleshooting] Deleted member 1890170:
Apps like Netflix can get installed on any rooted Android. You simply have to sideload them. If Android tells you sideloading apps is blocked, you will need to enable it.
[Samsung Galaxy S21 Guides, News] mzsquared:
Galaxy S21 series design flaw leaves a lot of room for user error

Samsung's new Galaxy S21 series, and especially the Galaxy S21 Ultra, is shaping up to be a great addition to ...

www.sammobile.com

" Samsung has relocated the SIM card tray with the Galaxy S21 series and this component can now be found at the bottom edge, right next to the microphone. As usual, the SIM tray can be ejected by inserting a SIM ejector tool into a tiny round hole, and it so happens that this orifice is millimeters away from the microphone, with both having roughly the same diameter. "

...open the link above for more.
[Samsung Galaxy S21 Guides, News] blackhawk:
Brilliant. That's going to make for a rude surprise.
[Samsung Galaxy S21 Guides, News] mostling:
The mic is not going to break, do you really think they didn't think of that?

The mic is not in the way of the actual hole..

After 4:50 here you see how flat the mic actually is.
[Samsung Galaxy S21 Guides, News] fillyo:
I did put it in the wrong hole lol...
[Samsung Galaxy S21 Guides, News] Electronic Punk:
You can see the outline of the sim card tray so didn't have this issue, also the back protection cover when you first take it out the box very specifically says where which hole to push - so hopefully not many will have any kind of issue.
[Samsung Galaxy S21 Guides, News] blackhawk:
"Pete always seems to get off at the wrong stop..."
[Samsung Galaxy S21 Guides, News] NippleSauce:
Whew. I thought that this was way more of a problem than it actually is. I was thinking that you have to be very careful when inserting the SIM tray back into your phone! But after reading this, no no, you just have to put the SIM tray removal pin into the SIM tray hole instead of ramming it through your phone's microphone lol. No problems at all, thankfully.

So I suppose that all of the people breaking their microphones aren't even looking at the bright labels that say exactly where to NOT place your SIM tray removal pin, haha.
[Samsung Galaxy S21 Guides, News] blackhawk:
So Samsung now is putting on bright labels?

Bah-ha-ha-ha... so there -is- a problem🤣

I suspect the labels only exasperates the direness of the situation like someone telling you "I told you so!"

Males with their refined tactile senses rarely use visual cues to find holes anyway.

Maybe Samsung should add a "wrong hole!" audio warning too🤣🤣🤣
[Samsung Galaxy S21 Guides, News] NippleSauce:
I believe that those labels have been there the whole time (found pics of the phone that were uploaded 5-6 days ago with those labels attached)... But I suppose that they're more visible on the phantom black version of the phone as the labels are all bright white. But either way, I don't really see this as a problem. I mean, the microphone hole isn't even touching or located on the SIM card tray, lol. So if someone ends up ignoring the labels and shoves they're SIM tray removal pin into the microphone hole, then they kinda deserve a broken mic, haha.