General G996U and G996U1 Firmware Links and Flashing Discussion Here

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mbuboltz

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Mar 23, 2016
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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
I try and flash the AT&T USERDATA but it is not flashing as I think my phone has a newer version and can't downgrade does anyone have the newer ATT userdata? I switched from Verizon to ATT and the phone is not connecting to data correctly as it only shows H+ not LTE or 5G.
 

mat_919

Member
Jan 6, 2014
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mat_919

Member
Jan 6, 2014
19
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The article states quite clearly that it's only for Exynos models
(y)Thank you!!! See... I missed it. just one word....:( Then... there's no way to root SM-G996U1 without paying for BL unlock first? Is that right?

edit: Never mind I found the thread for BL unlock. Thanks
BTW... You saved me a lot of headaches. My SM-G699U1 goes back today to Samsung. I've had it for one day.
 
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So I downloaded Odin 3.14.1 patched, I have a locked tmobile s21 plus and I installed all the drivers and Odin reads my phone as being plugged in when in Odin mode but it keeps failing, anyone else have a similar issue? I'm trying to flash to U1, I have the U1 software available in first post and I'm on the latest tmobile update
 

iBowToAndroid

Senior Member
Nov 9, 2010
4,349
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Twin Cities MN
So I downloaded Odin 3.14.1 patched, I have a locked tmobile s21 plus and I installed all the drivers and Odin reads my phone as being plugged in when in Odin mode but it keeps failing, anyone else have a similar issue? I'm trying to flash to U1, I have the U1 software available in first post and I'm on the latest tmobile update
"keeps failing" is very vague. We need to know the specific error messages that show on the phone and/or in Odin
 
this is the error i get in odin trying to flash tmobile to u1
 

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You're probably trying to flash bootloader 1 firmware to a bootloader 2 device. But I would need to see the error message that appears on the phone, in order to know for sure
I think it is because I'm on the latest T-Mobile update and the download in the OG post is from January so I used frija to download the latest u1 so I will try that today and if it fails I will post the error message that is on the phone
 

Chiripio

New member
Sep 22, 2019
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Santa Ana
Here with T-mobile version stuck on TMB/TMB/TMB after going to U1 firmware?
Is there a way to Fix this or with a new update?
thanks
 

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  • 1
    Only issues i have had not able to set phone number for voicemail and no call recording not sure what update i will get next and in developer mode no option for OEM unlocker.
    Any help would be appreciated.
    OEM unlock is never present on any U or U1 firmware.

    For the rest, you'll need to ask your carrier for assistance. I don't think there's much that any of us can do about that
    1
    I have a G996U AT&T device. If I install U1 firmware, will knox be triggered?
    It's impossible to trip knox on a U or U1 device, since they have locked bootloaders. So they won't allow you to flash something that would trip Knox
  • 5
    For those who aren't already aware, G996U is the model number of all of the US carrier versions of the S21+. The G996U1 is the model number of the same device, but sold by Samsung SIM unlocked and with no carrier bloatware. Firmware is 100% interchangeable among these models: any U or U1 firmware version can be flashed to any U or U1 device at any time, assuming that you're not trying to downgrade the bootloader. A "U to U" or "U1 to U1" flash does not require a factory reset, but changing from one firmware to the other will require one. 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. Where the firmware differs is in the USERDATA file - that's where the carrier bloatware and customizations reside.

    Manual Odin flashing is designed for those who:

    - want to manually update to a newer version of U firmware on their U device, either because they don't want to wait for their carrier's OTA or because OTAs aren't working on their device, or a different carrier got a new feature/patch before they did
    - want to flash U1 firmware to their U device
    - want to convert from U1 firmware to carrier U firmware
    - want to convert from one carrier's U firmware (with all apps and bloatware) to a different carrier's U firmware (with all apps and bloatware)

    For those who aren't already aware, anyone can now download firmware for almost any Samsung device any time that they want, via the various firmware download tools posted here on XDA like SamFirm or Frija. There are threads and info about them here on XDA so I won't waste time explaining - do a search if you're not already familiar with these tools. But they only provide whatever the latest/newest/current version is - nothing older. I pay for a subscription to a site that gets the official releases (usually) before they hit the firmware download tools, so that's where my files come from.

    This is not a "beginner's guide to Odin flashing" -type post/thread, so I won't list basic, step-by-step flashing instructions. My threads are geared towards those who already know what they're doing. If you're new to manually flashing Samsung firmware (or haven't done it in a long time), I recommend you consult one of those "beginner's" guides- there are tons of them here on XDA.

    Happy flashing!

    U firmware: https://www.androidfilehost.com/?w=files&flid=322091
    U1 firmware: https://www.androidfilehost.com/?w=files&flid=322092

    Notes:

    - DON'T QUOTE THE OP WHEN YOU REPLY, kthx

    - I have lots of threads just like this one for other Samsung flagships, if it interests you. For those who have already made use of my previous threads for a different device and are upgrading to an S21, welcome back :)

    - My zips are compressed extra small for space and bandwidth savings. The default Windows extractor can't handle it, so you'll need a 3rd party tool like 7zip, WinRAR, etc

    - it's quite time consuming to download the files, zip them up, and upload them to AFH. And, I do threads like this for every single Sx and Note x model, so I won't be uploading every single version. The only full builds that I upload are ones where I get access to a new bootloader and/or Android version early, before they hit the firmware download tools.

    - My naming method for folders on AFH is: build - bootloader - Android version
    So "SAT - 1 - 9.0" means the full build number ends in SAT, it's bootloader version 1, and it's Android 9.0. When bootloader and Android versions increment, the first build to have those changes will have its folder notated appropriately.

    - HOME CSC file keeps data intact; using the other CSC will wipe data. Flashing USERDATA will also wipe data.

    - Since AT&T doesn't allow their firmware to be publicly available (for any of their devices), I'll try to always upload at least one USERDATA per bootloader increment for AT&T (and Cricket, if they get this model). I'll also upload any full builds if AT&T is the only carrier to get that specific build, because you won't be able to find the files anywhere else.

    - For identifying USERDATAS, and to know what region/CSC to use in the firmware download tools if you're downloading yourself:

    AIO = Cricket (not available via firmware download tools)
    ATT = AT&T (not available via firmware download tools)
    BST = Boost Mobile
    CCT = Xfinity Mobile (Comcast)
    CHA = Spectrum Mobile (Charter)
    DSH = Dish Network
    SPR = Sprint
    TMB = T-Mobile
    TMK = Metro PCS
    USC = US Cellular
    VZW = Verizon (available via firmware download tools, but Manual Entry is required - Auto will not work)
    XAA = U1 firmware

    - the correct procedure for switching from one carrier's firmware to another is:
    1. Flash full U1 firmware package including non HOME CSC
    2. Upon boot, insert a SIM of the carrier whose firmware you want
    3. Watch for the popup that says "reboot to apply new carrier settings" etc, and do it
    4. After that restart completes, reboot back to Download mode and flash the full U firmware package, with the USERDATA file of the carrier whose firmware you want
    1
    Yep that one works in stock dialer. I've read that the csc dialer code doesn't work anymore for Android 11?

    *#1234# should too right? I can't get that one to work, error.
    I have no idea about "csc dialer code". When you said dialer codes weren't working, I assumed that you meant any/all of them.

    Yes,*#1234# should work also. At least, I haven't heard of them removing/discontinuing that one
    1
    I try and flash the AT&T USERDATA but it is not flashing as I think my phone has a newer version and can't downgrade does anyone have the newer ATT userdata? I switched from Verizon to ATT and the phone is not connecting to data correctly as it only shows H+ not LTE or 5G.
    Bootloader 2 USERDATA was added 3 weeks ago
    1
    Only issues i have had not able to set phone number for voicemail and no call recording not sure what update i will get next and in developer mode no option for OEM unlocker.
    Any help would be appreciated.
    OEM unlock is never present on any U or U1 firmware.

    For the rest, you'll need to ask your carrier for assistance. I don't think there's much that any of us can do about that
    1
    I have a G996U AT&T device. If I install U1 firmware, will knox be triggered?
    It's impossible to trip knox on a U or U1 device, since they have locked bootloaders. So they won't allow you to flash something that would trip Knox
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