Still seeing old carriers boot logo

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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.
 
Ok let me explain different way , your phone is sim unlock on a carrier version firmware, the unlocked firmware is totally different with U1 at the end of your model number which in your screenshot you don't have Screenshot_20211003-164153.jpg
 
I know little confusing , you have S after your U which still carrier firmware , you need to use this firmware and flash SM-G996U1 not SM-G996U
 
This is what Frija shows, G996U1 XAA
G996U1UEU4AUI7/G996U1OYM4AUI7/G996U1UEU4AUI7
Downloading now.
Since it will wipe the phone, does it kill the boot logo?
Hate to go through it again and Spectrum still be locked in.
Also, update with or without SIM?
 
Samsung calls it Master Unlock Code, got one from Spectrum, Device Unfreeze Code.
Just can't find a way to input, since phone is now unlocked.
Only asked for Unlock Code when I first put T-Mobile SIM, otherwise I wouldn't be going through this.