LTE and 3G not working anymore on G930T

Hello guys,

I got a Samsung Galaxy S7-G930T T-Mobile, and since yesterday, 4g and 3g aren't working anymore and my phone is showing 2g only...
I have already checked the settings and it is on LTE/3G/2G, and I have also checked the APN settings and they are good..
I have done a factory reset = didn't work
I have reinstalled the firmware = didn't work either..
I have checked if it was the SIM card problem by testing it on another 4g phone, and 4g worked perfectly..
The problem on my phone is that when i'm trying to force 3g only or 4g only, I lose all the signal (i can't even make phone calls) until I use 2g again..
So the problem is that my phone isn't supporting 3g or 4g anymore but only 2g..

Phone model number: SM-G930T
Android version : 7.0
Baseband version: G930TUVU4BQG5
Build Number : NRD90M.G930TUVU4BQG5

Thank you guys for helping me..

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