I'm having some strange issues, found this i9100 with a broken touch laying around I thought i'd put to use, got odin, flashed the pit and twrp re-partitioning, installed the latest twrp via 'dd', pushed all files in place, found an old 16gb sdcard, but no matter what i try i get 'Encryption Unsuccessful
encryption was interrupted and can't complete. as a result. the data on your phone is no longer accessible... etc..'
I've followed the first post to the letter, twice, i've not flashed gapps yet. /data cannot be formatted.
Edit:
I used adb to twrp to 'make_ext4fs /dev//block/platform/dw_mmc/by-name/DATAFS' then it started working and i could format /data from twrp menu again without error.