Step 1: Download and saved the update.
Step 2: Store the downloaded .zip file on a flash drive paired with a host cable and apply through the stock recovery (if you need to now how to enter recovery on your device see below).
In order to enter recovery on the Xoom, reboot the device and after the Motorola logo has been displayed for approximately three seconds; press the volume down button. The Android recovery logo will appear in the top right hand corner, at this point press volume up to select it. Once booted into recovery the only thing you should see on screen is an Android logo. If you wish to dismiss this menu press the volume up and down buttons together.
If you performed the above mentioned steps correctly then you’ll boot into Android 4.0.3 Ice Cream Sandwich on your Motorola Xoom.
