How To Guide F926U and F926U1 Firmware Links and Flashing Discussion Here

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Mar 26, 2022
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Samsung Galaxy Z Fold3
I haven't found it so not sure if it's even been released yet.
Do you know what code DSH is for?

1648349717784.png
 

HaykMessia

New member
Mar 27, 2022
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Anyone can help me with my issue?
I bought unlocked F926U model, but seen purchase (its been a long time) I doesnt get any update. Seller told that the version is from AT&T (I see Logo after restarting). Still I have F926USQU1AUG8 baseband and doesnt know when will get OTA update. Is there somehow that I can manually update the firmware on mac without harming device?
Sorry for such noob question.
 

HaykMessia

New member
Mar 27, 2022
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There will be no esim for this device.
I use it wothout eSim unfortunately( But there is one IMEI for this phone.
I just want to figure out, if I manually update firmware, is there any possible versions that phone become a brick? As seller told me he ordered a service to unlock the phone, and also send me the unlocking code.
 

cpufrost

Senior Member
Feb 26, 2012
1,494
484
Big Country
You need to have unique IMEIs for each line.
When I purchased dual sim capable versions overseas they did have two unique IEMIs printed on the label on the box.
 

cpufrost

Senior Member
Feb 26, 2012
1,494
484
Big Country
Ok yours is capable of two line operation for sure. In the past that would be called a duo model. My S9+ has a dual sim tray. That phone works really well but Verizon doesn't work with it unfortunately here in the 'States.
 

bmpponder

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Apr 5, 2022
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Hello all. I recently purchased a z fold 3 from att. Its on the way in the mail to me. I am just wondering. Im pretty sure its not going to be unlocked since Im gonna be making payments on it. Can I flash the firmware before I even set up the device to the official samsung firmware so I dont have to deal with att bloatware or do I have to wait til the phone is fully paid for and have it unlocked? just curious
 

iBowToAndroid

Senior Member
Nov 9, 2010
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Twin Cities MN
Hello all. I recently purchased a z fold 3 from att. Its on the way in the mail to me. I am just wondering. Im pretty sure its not going to be unlocked since Im gonna be making payments on it. Can I flash the firmware before I even set up the device to the official samsung firmware so I dont have to deal with att bloatware or do I have to wait til the phone is fully paid for and have it unlocked? just curious
It does not need to be SIM unlocked in order to flash U1 firmware
 

bmpponder

New member
Apr 5, 2022
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That's already given in the OP
Ok so I did some reading. and I mean a lot of reading. I have downloaded the U1 firmware for the Z Fold 3 using XAA for the CSC. As soon as I get the phone from AT&T I plan on powering it on to download mode/recovery mode and flash it to U1 using the the AP, BL, CP, and HOME CSC I got from downloading the latest U1 firmware. My question is after doing this. I just have to set the phone up as I would then pop the ATT Sim card into it. It will restart and I will have the ATT csc after?
 

iBowToAndroid

Senior Member
Nov 9, 2010
5,110
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Twin Cities MN
Ok so I did some reading. and I mean a lot of reading. I have downloaded the U1 firmware for the Z Fold 3 using XAA for the CSC. As soon as I get the phone from AT&T I plan on powering it on to download mode/recovery mode and flash it to U1 using the the AP, BL, CP, and HOME CSC I got from downloading the latest U1 firmware. My question is after doing this. I just have to set the phone up as I would then pop the ATT Sim card into it. It will restart and I will have the ATT csc after?
1. Download mode and recovery mode are 2 totally different things. Flashing is done via Download

2. Going between U and U1 always requires a wipe, so you'll need to use the regular CSC - not HOME

3. I have no idea what your CSC will look like after you flash. Might chance to XAA, might stay on AT&T. One way or another, bloatware will be gone
 

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  • 1
    Sorry so late, but i just got the z fold 3 unlocked from samsung, cricket is now selling the z fold 3 but I haven't been able to find their firmware, my phone will not stay connected or registered on network, always seems to have 5 bars but won't register...can someone point me in a direction or does it just not work with cricket yet. Of course cricket told me to go to samsung and samsung tested and said ev34ythings fine I need to talk to cricket.
    I have a source who can get me AT&T and Cricket firmware
    1
    Did someone already get the June update for U1/XAA? (I didn´t. And its not yet on sammobile/frija)
    (Just to explain my impatientness: I will have a business-trip in some days, where the eSIM/dualSIM update would be quite nice)

    Hmm.. And maybe someone could explain me one thing that I still don´t understand:
    If U are the provider version and U1 is the "unlocked and with no carrier bloatware" version. What are the so many U1-fimwares? ATT, TMB, XAA, ..... ? (No bloatware but different optimizations for the provider networks?)
    1. It's not out for XAA yet but you can flash any U1 firmware - doesn't have to be XAA

    2. Yes, the reason for all the U1 versions is that each one has the Settings preconfigured to different optimizations for the provider networks. The reason that it doesn't matter which one you flash is that the phone will re-configure itself to match whichever SIM you insert
  • 12
    For those who aren't already aware, F926U is the model number of all of the US carrier versions of the Z Fold3. The F926U1 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 have access to an internal Samsung firmware download tool that usually gets new versions before they hit the public 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=327754
    U1 firmware: https://www.androidfilehost.com/?w=files&flid=327755

    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, 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 flagship 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
    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
    2
    I guess what I'm asking is isn't there a way to just simply flash one of the US firmware's like XAA = U1 firmware or the CCT = Xfinity to enable the proper US frequency bands on a Physical dual sim international phone ?
    Nope. If you want US firmware, get a US phone
    1
    Is there a T-Mobile version available yet?
    Yep, firmware has been on Samsung's servers since last week
    1
    I downloaded the file from samefirm, and frija but did not get the carrier bloat or T-Mobile boot screen from either one. I have an unlocked version.
    You need to make sure your CSC shows as TMB, and need to make sure you're flashing USERDATA too
    1
    Did someone already get the June update for U1/XAA? (I didn´t. And its not yet on sammobile/frija)
    (Just to explain my impatientness: I will have a business-trip in some days, where the eSIM/dualSIM update would be quite nice)

    Hmm.. And maybe someone could explain me one thing that I still don´t understand:
    If U are the provider version and U1 is the "unlocked and with no carrier bloatware" version. What are the so many U1-fimwares? ATT, TMB, XAA, ..... ? (No bloatware but different optimizations for the provider networks?)
    1. It's not out for XAA yet but you can flash any U1 firmware - doesn't have to be XAA

    2. Yes, the reason for all the U1 versions is that each one has the Settings preconfigured to different optimizations for the provider networks. The reason that it doesn't matter which one you flash is that the phone will re-configure itself to match whichever SIM you insert