For those of you with rooted Atrix 4G who want to install one of the newer ROMs that support Ext4 filesystem (which makes your Atrix 4G super fast), you will need to update to the latest ClockworkMod Recovery 126.96.36.199, here’s how:
Step 1. Download this zip file and copy the whole zip file over to the root folder of your Atrix 4G internal storage or SD card:
Download ClockworkMod Recovery
Step 2. Next, turn off your Atrix 4G then boot into Fastboot mode by holding down Volume Down and Power button together.
Step 3. Hit Volume Down button until you see “Android Recovery” then hit the Power button.
Step 4. Select “install zip from sdcard” using Volume buttons then press Power button.
Step 5. Choose “choose zip from sdcard” and hit the Power button.
Step 6. Choose “Internal SD Card” or “External SD Card” depending on where you copied over the zip file earlier and hit the Power button.
Step 7. Choose “CWM-recovery-atrix4.1.zip” and hit the Power button.
Step 8. Choose “Yes” and hit the Power button.
Step 9. Go back to main menu then Advanced->Reboot Recovery.
Step 10. Verify your recovery has changed to v.188.8.131.52 and you are good to go.