According to P3droid, a number of Motorola devices running Android 4.0+ have been imbued with a new feature you might not have noticed: a visual root checker. It's present on the RAZR, RAZR MAXX, DROID 4, and test builds of the Bionic. It operates rather simply. Once a phone is rooted, somewhere in permanent memory, a status change is written that displays in the phone's recovery menu.

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