Yes u can find mokee and omni ROM too
Read the tutorial for installing miui
First downgrade to the right version(for modem), root your phone and install the"temporarily" recovery version
now u can install the custom ROM
(don’t use the option at the end of flashing to overwrite the stock recovery)!!!
the stock meizu recovery will be still there
never flash FlyMeOS over this custom recovery!!!
to go back, put official FlyMeOS(update.zip) in root of memory and flash with wipe data in “stock recovery”
Good luck and happy trying