Still seeing old carriers boot logo

[Android Central Question]

I purchased a Galaxy note 8 from Verizon years ago. After being with Verizon for a year I switched to TMobile to save some money and I brought my Verizon note 8 with me. I used the note 8 on TMobile for another year then I switched back to Verizon and got the pixel 4xl. I sold my old note 8 to a friend who was using straight talk as his carrier. The TMobile boot screen still pops up and he still get messages from T-Mobile and he doesn't have data when he is talking on the phone. Is there a way to fix this? The phone is unlocked and paid off. TMobile says they don't know how to get their stuff off the phone. Also I feel like they are messing with my data. I can't receive pictures unless connected to WiFi Any help is much appreciated.

 

[mustang7757]

Aren't I supposed to use download mode for Samsung phones?

Yes

 

[MNMobileGuy]

Just noticed after posting pic, unlock firmware for A115U1 is Android 11,
A115U is still on Android 10. Would that cause firmware not changing after Odin showed success?

Nope

 

[DLewis13]

See S21+5G SM-996U has newest Android 12.
SM-996U1 (Unlocked) isn't out yet.
Tempted to flash with SM-996U TMB version, but not sure what to expect.

 

[mustang7757]

See S21+5G SM-996U has newest Android 12.
SM-996U1 (Unlocked) isn't out yet.
Tempted to flash with SM-996U TMB version, but not sure what to expect.

You can always go back if don't like it

 

[DLewis13]

You can always go back if don't like it

The U version seems to include UserData, will that mess up the phone being unlocked?
Will the 1 be removed (SM-G996U) no more 1 in model number?
Will I end up with T-Mobile logo at boot, since unlocking, no boot logo except Samsung now?
Not feeling brave at this point.

 

[mustang7757]

The U version seems to include UserData, will that mess up the phone being unlocked?
Will the 1 be removed (SM-G996U) no more 1 in model number?
Will I end up with T-Mobile logo at boot, since unlocking, no boot logo except Samsung now?
Not feeling brave at this point.

No it won't mess with it being unlocked

The 1 will be removed

Yes Tmobile carrier boot screen will show instead of Samsung

 

[DLewis13]

No it won't mess with it being unlocked

The 1 will be removed

Yes Tmobile carrier boot screen will show instead of Samsung

What I guessed. Think I will wait.
Thanks!

 

[mustang7757]

What I guessed. Think I will wait.
Thanks!

Welcome!