Remove the battery and wait 5 seconds Put back the batterry and press: Volume up + send button+ power and hold for 10 seconds than follow the instructions.
If works ,say thank you Ninja!
3- Turn your xoom on and wait around 2 seconds and press the volume down key,scroll through the three options to fastboot. 4-Plug your xoom in to your pc via usb. now press volume up key to start fastboot.
5-Open command prompt: Start--RUN--and type cmd
. In command prompt type in: cd c:\ c:\>cd sdk c:\>SDK>fastboot oem unlock an folow instructions