I can probably reset again
If you search at pages 73 - 74 of this thread you will find my experience which was pretty similar.
I still think that it is better to change file system than format because format is not so clean as it should....
Is it normal to lose the DRM? My picture are awful now :(
No it is not normal, as I followed the steps and my Z3C D5803 is ok:
(Starting from rooted 575)
- Flash 291 excluding KERNEL
- Re-Apply root proceedure (TWRP, SUPER SU...)