Flashing different ROMS - Marshmallow down to Lollipop

N7 2013 LTE -> I was using factory Marshmallow and just unlocked bootloader, rooted and installed TWRP.

Can I flash any ROMs now? eg going back to a Android 5.1.1 ROM? Is it just a simple ROM flash?

from xda-developers http://ift.tt/1RbKdX2
via IFTTT