Board Thread:News and Announcements/@comment-26137249-20161103182145/@comment-27944970-20161109072616

Please note that it is possible to get the account back without friend code. This is done by trying to memorize which gold servants you own, theif (and Mashu's) levels, your account level, your most recent team, and the last place you fought in.

it takes time and sucks, but it works. it's how I reclaimed mine after something screwed up with my login