WTF! is it functional or is it really not stable and the most functions doesnt work??????
does it also work with the oneplus one?
Which are you referring to?
multiROM?
Sailfish Port?
Here's the MultiROM official thread on XDA: http://xdaforums.com/showthread.php?t=2011403 The best place by far to address any compatibility or function issues you have with MultiROM and the real, complete "How To" on installing and using MultiROM.
If it is the Sailfish Port... Have a bit of patience, Rome wasn't built in a day.