If you own a RAZR HD, RAZR MAXX HD, RAZR M, or Atrix HD, and you've been waiting for the day when sweet bootloader-unlocking goodness arrives, wait no more: Dan Rosenberg has come to the rescue yet again.

Dan just published a tool that will allow you to unlock any of the above-mentioned Moto devices, assuming you have root access on your phone. Just have a working superuser app on your device, download the tool, connect to your PC with USB debugging enabled, and run the included script. From there, follow the instructions.

There are a few catches. First, you must be rooted - some 4.1.2 builds for the supported devices do not yet have a working root method. If you can't roll back to an older build, you're out of luck for the moment. Second, only these devices will ever be supported with this exploit, because this tool relies on an exploit specific to Qualcomm devices. That means OMAP / Tegra-powered Motorola phones will never be able to use this same method to achieve bootloader unlock (eg, RAZR / MAXX, Bionic, Atrix, Atrix 2, any of the QWERTY DROIDs). The RAZR i is also not eligible for this method, as it uses an Intel processor.

Regardless, hats off to Dan for another brilliant exploit, the details of which you can read about here.