I purchased the Oneplus 7T from T-Mobile on October 18th. But the phone is locked and it also isn't running on OxygenOS if I'm not wrong. because I don't see the OxygenOS version on the 'About Phone' option.
I'm facing some issues such as if I open any game, the screen goes blank but it actually runs in the background. sometimes, if I lock the phone and unlock, then it shows the game's title screen. most of the time even if I unlock the phone, the screen stays blank and I end up shut down the phone by keep press and hold the power button.
Is there any way to go on an international framework by unlocking the bootloader? please help!!
thank you !!

I'm facing some issues such as if I open any game, the screen goes blank but it actually runs in the background. sometimes, if I lock the phone and unlock, then it shows the game's title screen. most of the time even if I unlock the phone, the screen stays blank and I end up shut down the phone by keep press and hold the power button.
Is there any way to go on an international framework by unlocking the bootloader? please help!!
thank you !!
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