I just got my OPO china version and use v2 to unlock my bootloader, flashed 44S successfully. But when I tried to use the root function without the need to install custom recovery, I was stuck at step 1. After loading the TWRP in fastboot, nothing happen. My OPO didn't reboot but stay at the fastboot. There is no way it is rebooting to TWRP recovery to flash the image for the root.