How To Guide G998U and G998U1 Firmware Links and Flashing Discussion Here

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iBowToAndroid

Senior Member
Nov 9, 2010
5,508
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1,752
Twin Cities MN
Hi guys I'm new to all this and I need help, I recently have a problem with my s20 ultra G-988u with the carrier cricket and I can't make or receive calls, and they told me my phone needed to be compatible model G-988u1, now my doubt is, can I change the model number to make it work?
You're in the wrong thread. This is for S21 Ultra, not S20 Ultra
 

bassman418

Senior Member
Sep 28, 2011
406
118
So I keep seeing that S21 Ultra has gotten update in US on carrier lock phones. My wife's phone has not yet. Even my sson'sNote 20 Ultra got ut days ago, and My S22 ultra week before that. Any one in here see it yet? Any link for update from 12?
 

iBowToAndroid

Senior Member
Nov 9, 2010
5,508
1
1,752
Twin Cities MN
So I keep seeing that S21 Ultra has gotten update in US on carrier lock phones. My wife's phone has not yet. Even my sson'sNote 20 Ultra got ut days ago, and My S22 ultra week before that. Any one in here see it yet? Any link for update from 12?
This thread is only for officially released Odin firmware flashing. If you want to know what the most recent version is, there are lots of ways to check that
 

bassman418

Senior Member
Sep 28, 2011
406
118
I was asking if anyone had come across the new firmware for the S21 ultra. I've looked since I've seen articles stating it's been released but have not found it while still waiting for her phone to get the OTA. nothing on samfirm, frija, or posted on Android file host. Looking for the full Odin file, of the firmware version i had posted.
 

iBowToAndroid

Senior Member
Nov 9, 2010
5,508
1
1,752
Twin Cities MN
I was asking if anyone had come across the new firmware for the S21 ultra. I've looked since I've seen articles stating it's been released but have not found it while still waiting for her phone to get the OTA. nothing on samfirm, frija, or posted on Android file host. Looking for the full Odin file, of the firmware version i had posted.
All of that is super vague. You need to be specific about what version you're looking for
 

carlossantana05

Senior Member
Feb 6, 2016
195
16
Greetings, I have the 998u1 CSC XAA model and I still haven't received the android 13 update, does anyone else have it? One other thing, what firmware or CSC version do I need to have to have the hiya (caller id and antispam) option built into the phone's native app? I had it from before on my s20 plus but on the s21 ultra it appears but it is grayed out I cannot activate it
 

bassman418

Senior Member
Sep 28, 2011
406
118
My Wife's 998U Verizon variant still has not received the update yet either. Makes no sense at all being my son's older Note20 ultra, my S22 ultra and even mid level phones have received. In some cases weeks ago.
 

Redhaired123

Member
Nov 30, 2022
5
0
Samsung Galaxy S21 Ultra
I have 988U ATT, I want to download the latest firmware from sam mobile. The only thing I can find for at&t is 988U1. I want to install a 998U firmware. Can I install a latest firmware for another carrier(USC)? and if so, do i need to factory reset my phone?
 
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EagerestWolf

Senior Member
Aug 9, 2011
184
146
Ripley, WV
Ok, I have skimmed through the thread (forgive me for not reading each post fully). I am in a bit of a bind. I am looking for a binary revision 5 AT&T USERDATA file for the SM-G998U, it doesn't really matter which build, if it is revision 5. I crossflashed my SM-G998U to an SM-G998U1 and it broke a couple of key features for me, the first being Visual Voicemail. It simply will not activate on U1 firmware. The other, as others have alluded to already, is WiFi Calling. I have an option to toggle it, and it says it activates; but it does not. All I need is the USERDATA file, everything else I can get from a USC/TMB/VZW build. I know it seems weird to want carrier bloat, but AT&T seems to be quite particular about devices on their network.
 
Is this the correct U1 firmware with no carrier bloat?

My understanding is this will break wifi calling. 5G ultrawide will still be available and features like 'call and text on other devices' will be available. Am I correct?
 

kemps

New member
Dec 22, 2022
2
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Samsung Galaxy S21 Ultra
Hi all, some advice needed here. I have an unlocked s21 ultra which was bought and used in the usa. I now have it on a UK carrier but the phone is unable to use the UK 5G bands. I was wondering if:

a flashing the phone to g889w (or g998b) firmware is possible.

b. if so, would it enable use of uk 5g bands.


Cheers
 

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    For those who aren't already aware, G998U is the model number of all of the US carrier versions of the S21 Ultra. The G998U1 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=322089
    U1 firmware: https://www.androidfilehost.com/?w=files&flid=322090

    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 carrier's firmware 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
    3
    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.
    2
    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
    2
    Could you please find me the USERDATA for Verizon please?
    U firmware is now live on Samsung's servers, so anyone can use the various firmware download tools like SamFirm or Frija to get whatever they need (AT&T and Cricket excluded)
    If I have tmo and flash u1 will I still receive ota updates in the future? Or will I manuallt have to flash new update everytime?
    Yes, you'll get OTAs
    2
    I would think you would have most features since the U1 firmware is sold by Samsung to work on networks like T-Mobile. However, all I can verify for you is that I got my wifi calling and I have a 5G icon with 305Mb on speed test. This is after flashing U1.

    I had the same issue. Out of the box, without even turning the phone on, I flashed the U1 firmware on my T-mobile S21 ultra but the device just kept saying "NO SIM"

    If you have a T-mobile device, turn it on with an active sim card first with the original U firmware. Don't need to go through the setup, just have to let it find a LTE/5G signal. After that you can power down and flash U1 firmware and won't have any SIM issues.

    Hope this might help anyone who might run into the same issues we did