Unlocking bootloader is not possible from Oxygen OS 12.1. You have to unlock on OOS 11 and then local upgrade to 12.1 to keep the bootloader unlocked.@shantanusarkar
Bro, I was on PE 12 (your previous build) , as soon as the 13 build was released I rolled back to A10 using msm and then updated to 11 using system updater. But after that the required 12.1 release was not available for me. So I used oxygen updater to update to the latest firmware.
But when I'm trying to unlock the bootloader, it shows an error like " can't unlock dur to technical issues" . This is the first time I'm facing this. I had toggled the OEM unlock option, usb debugging etc. Can u help me here?