I may sound a bit overcautious, but I would like to know how to update the firmware first.
I run 15.1 and TWRP 3.2.3-1 on my op3. Do I just download the 5.0.8 zip, put it on my device, boot twrp and flash it like I would flash a new rom or gapps?
Is there a way to determine what Firmware I am...