The update firmware which has a build version of 4.5.91 and anyone needs to be on 4.1.83 or 2.2 froyo from previous release to avail the upgrade.
For those interested, you can head-over to Motorola’s Atrix
Download AT&T Motorola Atrix 4G Android 2.3 Gingerbread 4.5.91Firmware Update now available
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