Problems after new Android 7.0 update on Samsung Galaxy s7

[nieku]

Hello, so recently I bought a refurbished samsung galaxy s7 (Verizon version) and I live in Europe, Republic of Moldova. So, the phone is unlocked and working global (that says) and I have some problems. When i got the phone it had android 6.0. Everything worked fine, the sim, ussd codes, 3G internet. I didn`t have any verizon crap or apps.
After that, i`ve upgraded to android 7.0 via Odin. I downloaded an official android for verizon s7. Now, with android 7.0, when i open my phone, i get the verizon greeting message (like welcome and verzion logo).
Then, everytime i restart the phone i get the message that my sim is not from verizon wireless. Now, i can`t call any USSD codes (for example *200# that is the code for checking my sim balance). It just shows that it calls the ussd code and then says that the number is incorrect. Also, i can`t connect to the internet. I tried to find the Acces Point Names, but they are nowhere (like this function was deleted).
Also, in my settings app, i have 2 unknown options. T roaming and Service provider Giga LTE, KT twophone service and whenether i enter them, my settings app just crashes and it wants to restart it.
Also... i have a lot of verizon apps..
I tried going to my SIM carrier and they said they dont know how to solve it.
Please help me! Thanks in advice! :3

 

[oneeyecarpenter]

This sounds like a complicated issue, and so, I recommend you visit the forums at XDA Developers, because of more people with ROM expertise. Do a search on their site first before posting questions. But, you might try reversing or reverting back to your back up, if, hopefully you made a complete back up.
Here is the forums link: https://forum.xda-developers.com/all

 

[chanchan05]

When you say you downloaded an official version, that means you didn't do it via the software update in the phone?

Sounds like that's the problem.

 

[nieku]

I don't know.. i think so..
I found a topic on XDA developers and thrn I downloaded it from there..

 

[nieku]

Oh, thanks I'll try there