For those of you who want to install new ROMs like the rooted Gingerbread ROM (that I have right now), you will want to unlock the bootloader on your Atrix 4G and install permanent ClockworkMod Recovery.
This method is for Windows computers, if you don’t have one, I suggest to borrow your friend’s for couple hours.
Make sure you’ve rooted your Atrix 4g first!!!
To do this, you will need to download the atrix4gcwm2.zip file: