not wipe system! TWRP wipes data and casheThere is at least one post that says NOT TO wipe after flashing the bootloader.
As written in the 1st post.
not wipe system! TWRP wipes data and cashe
any way i back to lolipop cant stand those mm bugs:
1. screen is dimmer then LP i had to use 50% instead 0% doze its no realy doze if you forgot close apps
2. ringtone is lower quality and volume
3. cant store backups to microsd
4. cant store voice recordiongs to microsd
i wait untill xda / LG get it together samsung never make those mistakes