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After failing to search for a complete post on unlocking the Atrix 4G on Gingerbread; I decided to create my own post for everyone owning this beast of a phone. This post will guide you on unlocking the bootloader, installing a recovery rom, and installing a custom rom closely matching the stock rom, but with additional capabilities.
Before continuing, concepts like rooting, recovery rom, or unlocking the bootloader should be clear; if not, please read my other post on rooting android.