You must first install CWM using ADB to flash the CWM image or use ROM Manager from the market to flash CWM for the XOOM
How to flash CWM
1.Open ROM Manager
2. Select "Flash ClockworkMod Recovery"
3. Select "XOOM"
4. Clockwork is now installed
How to navigate in CWM
Use volume buttons to move up/down and use power button to select
ClockWorkMod (CWM) Recovery options
Reboot System Now - Reboot your XOOM
Apply update from SD Card - Only Motorola signed updates can be installed using this
Wipe data/factory reset - Clears all data on your device. Does not touch the external SD Card
Wipe cache partition - Clears cache
Install zip from SD Card - Use this to install zips in update.zip format
Backup and restore - Backup up device image or restore a backup
Mounts and storage - Manage how your device is accessed
Advanced - Other option
Go Back
How to manually boot into clockwork mod Recovery
3G XOOM only- Hold volume down for 5 seconds