Works on any Atrix, rooted, deodexed, stock, doesn't matter!!
OLYFR_U4_1.2.6 supported
OLYFR_U4_1.5.2 supported

Features:
Root
Installs tethering apn(enable the apn AFTER you enable mobile hotspot)
Unlocks all APN's for editing
Enables init.d support (on the android side, sample script mounts /system rw)
Installs Superuser.apk
Enables Non-market apps (sideloading)
Installs su and sqlite3 binaries to /system/bin
Removes oneclickroot busybox mess (if it exists)
unRoot script

How to use:
note: xp users, you will get an error about the TIMEOUT function, ignore it.
Enable USB Debugging on your phone (settings > applications > development > enable USB debugging)
Plug your phone into your computer
Extract aRoot.7z
Run aRoot.bat (run unRoot.bat to unroot)

Download:
Download aRoot!


Total Credits: designgears