Make sure you delete /data/alsa folder and reboot. Use Root Explorer
I found this ROM for Mt788 which is the chinese Razr I (without 3g). Maybe it can help further development for XT890 or give a clue about the next update. I'm no dev so i hope that it helps.
Maybe with xposed+gravitybox?
Sent from my Nexus 7 using xda app-developers app
I confirm that it works!
I'm studying this myself but there is a lot that i need to learn. Check those to see if helps.
How you installed CWM? Was using this? Which CWM version are you using? Tried to flash to stock?