[Q] G2 INT, Trouble. topic

Hello everyone. So i had a custom Rom installed and LG brought an update to my phone,so i pressed update and i got > Secure boot error < and thats it , I would appreciate any help - cause Recovery ,downkoad mode ,sideload nothing works. just can make a factory reset but it does nothing, and pc is not recognizing just opens a bunch of local disks that needs to be formated but cant do that cause its write protected, please if enyone knows what to do ,help...