Motorola has rolled out OTA update for the Xoom that includes support for Flash 10.2 and Daylight savings update. However, in order to get the updates installed, the tablet needs to be relocked and unrooted. Here is how to do it:
First, make sure you have setup ADB connection between Xoom and your computer. Follow my ADB Windows Setup guide for more instructions. Now, download the stock firmware from here. Extract its contents.
Now, we will flash the stock image. To do this, copy the extracted contents of “MZ600_HRI39“ to “platform-tools” folder to ADB setup and connect your Xoom to the computer via USB. Fire up command prompt and type in these commands (make sure you are in ADB binaries directory in command prompt).
adb reboot bootloader
Above command will reboot your device in bootloader mode. Now, type in these commands one-by-one.
fastboot flash boot boot.img
fastboot flash system system.img
fastboot flash recovery recovery.img
fastboot flash userdata userdata.img
fastboot erase cache
That is it! Now, follow this guide to relock your Motorola Xoom. Only then you will be proceed with OEM updates.