[Guide] - Odin Upgrading / Flashing and N986U to N986U1 & Vice Versa

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    That's interesting Shaun, if memory serves me correctly back in the days the sim unlocked Samsung devices would brand switch only when changing SIM cards. The unlocked by Samsung U1 ones didn't.

    Edit. Memory obviously doesn't serve me correctly. 🤣
    Well, I also have memory lapses, and it's been a couple of months, but I think in this case I was ASKED if I wanted some T-mo bloat, and I chose yes because I like a few of their features (and mistakenly thought it would give me eSIM.)
    Hi I have a note 20 Ultra from Xfinity. I paid it off, and got it unlocked. I would like to get rid of the bloatware also change apn settings. I have the N986USQSDUE2 and the latest july patch update from samsung. Can I switch to U1 factory unlocked? since it looks like booatloader 2? what version of U1 do i need?
    If you're on bootloader 2 then you'll need bootloader 2 U1.
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    WARNING - Samsung has upgraded to Bootloader 2, if you are on bootloader 2 you can not flash U to U1 or U1 to U until a solution is found
    INTRODUCTION - Firstly sorry for posting this as this is common knowledge for many. I still see so many people asking the same questions again and again and i do want to help so decided to write a guide.
    If you have Odin Flashing questions please ask here. I have converted a device from U to U1 (just for fun) so i know this works, many other users have confirmed this too.
    PART 1

    Pre-Requisites - PC / Laptop, USB Cable, Phone
    Switch on USB Debugging from Developer options. To turn on developer options go to Settings>>About Phone>>Software Information>> Then tap the build number 7 times - Developer options will appear at the bottom of Settings Menu.

    HOW TO - N986U to N986U1 and or Flash ATID or Flash Any Odin compatible ROM
    1. If you want to flash or update to One UI 3 Beta then Download the ATID Firmware here.
    For changing Carrier locked device to Unlocked Firmware (N986U to N986U1) Download the firmware for U1 from OTA Thread or by using Frija

    If you are Flashing One UI 3 Stable download the appropriate firmware. There are many resources for that, there is a thread in the N20 Ultra forums, there are tools like Frija and SamFW and more, then there are various websites. Where you are downloading from is your outlook just ensure you download Odin compatible ROM.

    2. Download Patched Odin here
    3. Unpack/Unzip what you downloaded in Step 2 (Odin Compatible ROm) and put in a folder. Lets call the folder "Flash"
    4. Run Odin, click on BL, Browse to the "Flash" folder, add BL file from there, Do the same for AP (click on AP, Add AP file, this will take some time), Same for CP (click on CP, Add CP file)
    5. Do the same for CSC (click on CSC, Add the file with the name starting with Home_CSC). If you use Home_CSC your phone will not get formatted and data will remain Intact
    USERDATA Stays empty.
    6. Now connect USB cable to your laptop (Only laptop and not the phone)>> Turn off your phone >> Press volume up and volume down keep them pressed and plug in the USB type C into your phone.
    7. You should be in download mode now, press volume up. In Odin you will see that phone is added.
    8. Press start in Odin. Wait for it to finish and let the phone restart (it will happen On its own).
    9. Done

    PART 2
    HOW TO - N986U or N986U1 Latest Security Patch or Firmware upgrade / downgrade
    1. Download the firmware for Corresponding device - For example if you are on SM-N986U1 then download for U1. If you are N986U locked to TMB, VZW, SPR etc etc download the firmware for U device and your Own CSC from OTA Thread or by using Frija or SamFirm tool.
    2. If downloaded using Frija or SamFirm Tool it will be in a compressed folder (ZIP). Extract the firmware files in a folder, lets call it "Flash"
    Follow the rest of the steps from Step 4 Above.

    Can I get E-Sim with this ?
    If you are doing this to get E-Sim capability that t-mobile just added
    here is a post from someone who converted their phone to T-Mobile version.

    WARNING - If for some reason you use ODIN to Flash back to Android 10 after being on Android 11, YOU WILL LOSE YOUR DATA
    This is not a guide for Downgrading by whole Android Iteration as in Going from Android X to Android (X-1) or Android (X-2) ____ Versions
    Another reason to switch to U1 firmware is the ability to get access to features that are disabled on carrier versions.
    I went to U1 firmware so I could enable "Call and text on other devices" and get rid off the carrier bloat.
    This is disabled on AT&T and Verizon versions... not sure about T-Mobile/Sprint devices.
    I've been using the u1 version on my u from att after like a month and it's been working great. I also got the april security patch on the 1st so it's definitely being great.
    I have been trying to odin my att note 20 ultra to the t-mobile firmware, so far I've only been able to get it to boot like it is the unlocked version, and can't find the reason
    I dont know anyone who has done such a thing but i guess there is a use case for everything. Have you tried flashing unlocked Variant first and then Odin to T-Mobile.
    I am trying to switch from U1 to U VZW brand. I get this error

    <OSM> Enter CS for MD5..
    <OSM> Check MD5.. Do not unplug the cable..
    <OSM> Please wait..
    <OSM> Checking MD5 finished Sucessfully..
    <OSM> Leave CS..
    <OSM> Enter CS for MD5..
    <OSM> Check MD5.. Do not unplug the cable..
    <OSM> Please wait..
    <OSM> Checking MD5 finished Sucessfully..
    <OSM> Leave CS..
    <ID:0/007> Added!!
    <OSM> Enter CS for MD5..
    <OSM> Check MD5.. Do not unplug the cable..
    <OSM> Please wait..
    <OSM> Checking MD5 finished Sucessfully..
    <OSM> Leave CS..
    <OSM> Enter CS for MD5..
    <OSM> Check MD5.. Do not unplug the cable..
    <OSM> Please wait..
    <OSM> Checking MD5 finished Sucessfully..
    <OSM> Leave CS..
    <ID:0/007> Odin engine v(ID:3.1401)..
    <ID:0/007> File analysis..
    <ID:0/007> Total Binary size: 9881 M
    <ID:0/007> SetupConnection..
    <ID:0/007> Initialzation..
    <ID:0/007> Set PIT file..
    <ID:0/007> Get PIT for mapping..
    <ID:0/007> Firmware update start..
    <ID:0/007> NAND Write Start!!
    <ID:0/007> SingleDownload.
    <ID:0/007> abl.elf
    <ID:0/007> xbl.elf
    <ID:0/007> FAIL! (Auth)
    <ID:0/007> Complete(Write) operation failed.
    <OSM> All threads completed. (succeed 0 / failed 1)
    <ID:0/007> Removed!!
    Are you trying to go from the unlocked 3.1 DUC1 build to VZW firmware? They updated the bootloader from BL1 to BL2 on DUC1 so we are not able to roll back to anything older. The VZW firmware is still on BL1.

    If that is the case will have to wait for VZW to release new firmware with BL2 before you can switch. My guess would be it will be included in next months security patch update.