NOTE: YOU CAN NOT DOWNGRADE FROM 5.1.1 SO TWRP OR CWM HAVE TO BE THE 5.1.1 VERSION.
BACKUP EFS FOLDER!
Download metropcs firmware of the device in this case, SM-G920T1.
Flash phone with it.
If the phone turns on but says Kernel is not SEandroid enforcing and stays at Samsung logo download this [KERNEL] UniKernel v8-0002 COH9 [G920 /925] | Samsung Galaxy S6 and flash it via odin
Flash TWRP recovery
Now you can use a software such as chimeratool or z3x to read codes. and unlock.
If you do not use a box you can also buy the unlock code from an online source.
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T-Mobile S6 SM-G920T Unlock & Debrick
