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G981U and G981U1 Firmware Links and Flashing Discussion Here

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iBowToAndroid

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Nov 9, 2010
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How long do the updates for the s20 unlocked variants usually lag? I remember experiencing the same obnoxious update lag issue with my s8 950u1 and I'm surprised Samsung hasn't straightened this out yet.
There's nothing to straighten out - they do that on purpose. U variants outnumber U1s by 25 to 1, I'm sure. So they want to focus on getting the update out to as many people as possible to begin with.
 
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losonn

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There's nothing to straighten out - they do that on purpose. U variants outnumber U1s by 25 to 1, I'm sure. So they want to focus on getting the update out to as many people as possible to begin with.

I get the logic. It's just counterintuitive that the updates for the unlocked s20 variants that don't require integration of carrier bloatware or carrier specific testing are somehow the updates that get rolled out last.
 

iBowToAndroid

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I have G981U1 and on Beta One UI 3.0 and just checked. Nothing new.
Idk exactly how their beta system works, but you may have to be on an official stable (10.0) build in order to get it. If they do allow you to OTA from a beta build, then it will take time to be pushed to your device. All updates are always staged in rollouts, regardless of carrier or version.

I just checked and the Odin files are on Samsung's server though, available via Frija for anyone who wants to update immediately
 

xela19115

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Dec 9, 2010
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Samsung Galaxy S20
Idk exactly how their beta system works, but you may have to be on an official stable (10.0) build in order to get it. If they do allow you to OTA from a beta build, then it will take time to be pushed to your device. All updates are always staged in rollouts, regardless of carrier or version.

I just checked and the Odin files are on Samsung's server though, available via Frija for anyone who wants to update immediately

Just got it.

Screenshot_20201221-210003_Software update.jpg
 

venkycool

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Jul 24, 2016
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I have s20(SM-G981U) locked to t-mobile USA I want to know If i flash U1(XAA) firmware will it unlock the device and able to use it with any sim?
 
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ththugues4

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Dec 31, 2020
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I have s20(SM-G981U) locked to t-mobile USA I want to know If i flash U1 firmware will unlock the device and able to use it with any sim?

my s20 to lock on t-mobile I just tried it by flashing the room of sm-981u for sm-981u1 according to the various advice of the people of this post, I can download the updates from samsung, for what is the network locking this is still active but with the only difference that it requires an unlock code, things that with the t-mobile rooms it did not require.

how do you get this unlock code?

Thank you all
 

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ththugues4

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Hello

I just flashed my locked phone on T-Mobile with the SM-G981U1 room. Now my samsung asks me for a SIM unlock code (Herewith Photos.) With input box.

I would like to know a reliable solution how to get this unlocked?

Thank you
 

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iBowToAndroid

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Hello

I just flashed my locked phone on T-Mobile with the SM-G981U1 room. Now my samsung asks me for a SIM unlock code (Herewith Photos.) With input box.

I would like to know a reliable solution how to get this unlocked?

Thank you
go to doctorsim.com and ask for unlock code they will charge you around $25
No, that won't work. There is no code that you can get in order to unlock the device, because T-Mobile does not use unlock codes by default - so therefore no code exists in the database, like they do for the carriers which DO use unlock codes. Unlocking a T-Mobile device is much more complicated and difficult than that. I can provide a recommendation for a professional 3rd party unlocking company if needed
 

iBowToAndroid

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AT&T USERDATA for Android 11 has been added - build TL1.

Someone else already beat me to uploading the full TL1 firmware package on AFH, so you can download that if you need the rest of the Odin files.

And from now on, you can expect AT&T USERDATAs to be added right away, when new bootloaders and new Android versions are released :)
 

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    For those who aren't already aware, G981U is the model number of all of the US carrier versions of the S20. The G981U1 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 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 SamFirm/Frija, so that's where my files come from. However, I don't have unlimited bandwidth on the site, and it's also 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 SamFirm/Frija.

    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=305577
    U1 firmware: https://www.androidfilehost.com/?w=files&flid=305578

    (Quebec tends to be the fastest download mirror, if it gives you that option)

    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 S20, 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

    - 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 SamFirm/Frija:

    AIO = Cricket (not available via SamFirm/Frija)
    ATT = AT&T (not available via SamFirm/Frija)
    BST = Boost Mobile
    CCT = Xfinity Mobile (Comcast)
    CHA = Spectrum Mobile (Charter)
    SPR = Sprint
    TMB = T-Mobile
    TMK = Metro PCS
    USC = US Cellular
    VZW = Verizon (available via SamFirm/Frija, 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
    Pre-release notes:

    1. I do not have one of these and do not plan to acquire one, so I have no idea if anything can actually be flashed at this moment - I'm just providing the firmware. Like all other models, I'm assuming patched Odin is needed for this, but it wouldn't surprise me if a new version is needed for this specific device. There's only one way to know though, so as soon as someone gets their hands on one and can try this, please let us know.

    2. I don't know if using the HOME CSC will actually save data. I don't get access to that file straight from the source - I have to decompile the regular CSC, remove the parts that initiate the factory reset, and then re-compile it. Based on the S10 and Note 10, I've done what I think will avoid a factory reset. But the S20 has some new partitions, so we won't know for sure until someone tests it. So if you're willing to be that guinea pig, you're responsible for taking proper steps to avoid an FRP lock, make sure your data is backed up, etc
    1
    I want to flash my unlocked samsung s20 so I can use the ATT Volte and wifi calling but will rom eventually get released
    If you're saying that you want AT&T apps and bloatware and features, then all the files that you need are already linked in the OP
    1
    I'm worried that I already know the answer, but i'm asking it anyways. I'm currently on a SM-G981N (South Korean version), which is a Snapdragon865 phone. I'm wondering if I can change my firmware to the SM-G981U version to get rid of the bloatware on my phone. For what I read for other phone's this wouldn't work. Perhaps I should start looking for an unbloated SM-G981N rom? Thanks!
    I'm assuming the flash would fail. But there's only one way to know for sure
    1
    Got it figured I used the wrong firmware
    Oh okay :)