Format data with yes or flash DFE if your data is decrypted and you don't want to encrypt data.
Thanks, that may be it, but I never heard of DFE before when flashing roms and can't find an official thread. I have never had to format storage when clean flashing roms. Is it because Los17 forces encryption? Even Miui.eu doesn't force encryption. Also infrag says only format data including storage if coming from MIUI and encrypted data, which is not my case...
By formatting data, you mean formatting internal storage aswell? Because there is wipe /data which I did, and format /data which erases internal storage afaik.
Those above who flashed successfully, did you format internal storage aswell?