How to root Atrix 4G

Get root img and fastboot from:
http://briefmobile.com/motorola-atrix-4g-root

How to enter fastboot mode:
Turn off your device. – Hold down the power button and downward volume button until you see “Fastboot” on your screen – Push the upward volume button

On fastboot binary file on linux is in: $BSP/out/host/linux-x86/bin/fastboot

How to Root:
fastboot flash preinstall root.img
fastboot reboot
Enable USB debugging (Settings >> Applications >> Debugging)
Type the following commands
adb shell
$/preinstall/dosu
Type the following commands
#/bin/mount /system -o remount,rw
#cp /preinstall/su /system/bin/su
#chmod 6755 /system/bin/su
#PATH=/system/bin:$PATH pm install -r /preinstall/Superuser.apk



Enable Tethering on 4.5.91
Others the same as Atrix 2
4. go to Line 118 labled Entitlement Check with a value of 1
5. Change value from 1 to "disabled" (without quotes)
6. reboot