My girlfirend's phone (a brazilian model SB6102B) got stuck into a bootloop showing this message on recovery mode "failed to mount /data (invalid argument)". Wiping cache and data/factory reset did no good. Following this tutorial the phone got back up, but then the touch was not working. I downloaded the latest brazilian ROM from Sammobile, flashed it with Odin and the phone is now working again! When I get home tonight I'll test the SIM card, as the baseband is not the correct one, so I'll probably need to flash the brazilian modem. Thanks for the post, great work!