1. mlbyanks11's Avatar
    Hi all - Just wondering is this something that is possible? I have an AT&T s21 ultra with a Verizon Sim card in it. It is an AT&T branded device but like I said unlocked and has a Verizon sim card in it.

    How do I go about flashing the OEM software onto it? I tried via Odin but it fails. Got the firmware from sammobile.com as per shown link below. Some guidance is appreciated. Please and thank you.

    https://www.sammobile.com/samsung/ga...2AUB5/1496295/
    06-16-2021 09:02 PM
  2. bxrider117's Avatar
    It can be done but the link that you loaded looks to be an older version of the Verizon software. Are you in the At&t version of this same software? To make it work you can not downgrade to an older software version. You need to be upgrading to similar or newer version.
    06-17-2021 12:03 AM
  3. mlbyanks11's Avatar
    so where do I find it then? I figured that. any ideas?
    06-17-2021 07:06 AM
  4. ironass's Avatar
    so where do I find it then? I figured that. any ideas?
    These are the 5 updates so far for the G998U regional model on Verizon...

    https://samfrew.com/model/SM-G998U/region/VZW/
    aximtreo likes this.
    06-17-2021 07:16 AM
  5. mlbyanks11's Avatar
    These are the 5 updates so far for the G998U regional model on Verizon...

    https://samfrew.com/model/SM-G998U/region/VZW/
    Thank you so much for that.
    ironass likes this.
    06-17-2021 07:36 AM
  6. mlbyanks11's Avatar
    So I flashed the firmware onto my s21 ultra and it did not work. still has AT&T branded software. followed instructions directly through odin.
    06-17-2021 07:48 PM
  7. mlbyanks11's Avatar
    can anyone assist please?
    06-17-2021 10:12 PM
  8. mlbyanks11's Avatar
    Where am i going wrong can someone please assist on this? I flashed the VZW OEM firmware to my phone and it still came up as AT&T once completed. Anyone?
    06-18-2021 10:19 AM
  9. ironass's Avatar
    Where am i going wrong can someone please assist on this? I flashed the VZW OEM firmware to my phone and it still came up as AT&T once completed. Anyone?
    My only thought is that the AT&T and Verizon carrier models used to be famous for their own carrier mega locked down bootloaders that prevented flashing firmwares and rooting. See #1.6, here...

    https://androidforums.com/threads/42...-guide.892162/

    This xda developers thread appears to confirm my initial thoughts that the AT&T carrier locked devices, (G998U, G996U and G991U), have an unlockable bootloader that prevents installing other firmwares. See...

    https://forum.xda-developers.com/t/b...ltras.4258151/

    It would not surprise me if the Verizon carrier, "U", models also were running their own carrier locked bootloaders as well. This would not affect the U.S.A. non carrier, "U1", variants.
    06-18-2021 10:56 AM

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