hiya mate the first flight i flashed on my i9500 and its brill
and the thor rom is for the i9005 ive got both so if u email me ill mail em too you if u want
so yes mate u got the i9505 so the thor rom would run on that ,aint tried the first flight rom on that model yet tho.but id recommend doing it,tweak the cpu,battery life etc..no faults at all