first time OP7 Pro root, trying to install pixel experience rom. got fastboot, oem unlock and twrp successfully done but i cannot boot into twrp. back in stock OS so not bricked, but even after i repeated and flashed twrp (allegedly powershell says it was successful), i just cannot boot into twrp recovery. i downloaded the 10.3.8 directly from oneplus' site, not sure if i need to flash that first and try twrp again? i just have no idea what i'm doing wrong. thanks for any help!