Sorry to post here again for P905 but as I don't have the requested 10 posts, I cannot post in the right thread.
I have the same problem as js345 : stuck at the galaxy screen. I use TWRP and was on the official firmware.
I have however an issue. I made a backup using TWRP on my external SD card (which seemed to work great: MD5 sum and so on worked) and wanted to restore it but when I open RESTORE in TWRP, it remains empty (wether I choose internal or external SD). I am now downloading official firmware but I would like to know if there is a workaround to restore the backup that TWRP does not propose.