Here is a step by step guide to root your xoom that is already updated to 3.1
You might also find this useful if you relocked your device to get the 3.1 update.
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1. All steps are for the 3G Verizon Wireless Xoom. The steps are almost the same for WiFi but the files you need to download are different. You can find everything for your Wifi Xoom here:
http://xdaforums.com/showthread.php?t=1078019
2. You will lose all data by unlocking your device. This is just something you will need to plan for. Backup everything BEFORE you start this. If you Have any questions about backing up your data I will be happy to help.
If you are already unlocked then you dont need to worry about this. /win
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How to use this guide
.....PLEASE READ THIS!......
This guide is divided into 3 sections:
1. Root Your Xoom
2. Flash CWR
3. Flash Kernal
These sections must be completed in order. If all you want is root then just do the 1st section. If you want SD card support then you must do all 3 steps.
Each section has its respective folder in the .rar file that I’ve linked Below.
1. Root files
2. CWR files
3. Kernel
As you work your way through this guide I will refer to files located in these folders.
All files used in this guide can be found here:
https://rapidshare.com/files/2447837220/3.1_Root_and_Recovery_Tools.rar
Or Here:
http://www.megaupload.com/?d=S9BTBCC6
Lets get started!!!!
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Unlock and Root Your Xoom
>Root Files folder<
Steps found here:
http://xdaforums.com/showthread.php?t=968342
1. Download the Motorola Xoom Root Zip file and unzip it.
(I replaced thes files with "root31.img", "SU", "superuser.apk" All found in the "Root Files" folder if you use my download link)
2. Place the files in the SDK Tools folder.
(You can skip the next 3 steps if you’ve unlocked with fastboot previously or if you lost root due to upgrading to 3.1)
3. adb reboot bootloader
5. fastboot oem unlock (wait for reboot)
6. adb reboot bootloader
7. fastboot flash boot (name of new boot.img(root31.img attached))
7. fastboot reboot (wait for reboot)
(you will need to enable usb debuging here)
8. adb remount
9. adb push su /system/bin
10. adb shell ln –s /system/bin/su /system/xbin/su
11. adb shell chmod 4755 /system/bin/su
12. adb push Superuser.apk /system/app