You have KitKat running. Now what?
The Motorola XOOM refused to die. Thanks to the developers at Team EOS and the archivists at XDA, neither does the spirit of early Android. motorola xoom mz604 custom rom
Here are the three viable paths for the MZ604. Do not flash generic "Wingray" ROMs from shady sites; stick to XDA-Developers archives. You have KitKat running