My friend asked me to fix his phone(Samsung Galaxy S3 GT-i8190), coz I know a bit of flashing roms myself. But only flashing roms using recovery mode. His first problem was his phone won't suddenly turn on. He said he was just charging and then it just won't turn on. He asked his friend to try fix it. He did, but I guess the rom is gone. It just goes stuck on bootloop. I can't even access recovery mode. The symbol of recovery mode shows up a bit and back to boot loop. Download mode works, but no idea how it can help. Hope you can.