Here’s another method of rooting your Droid Bionic using the MotoFail rooting tool.
THIS IS FOR GINGERBREAD ONLY, for ICS, see here instead!!!
Step 1. Make sure “USB Debugging” is checked ON under Settings->Applications->Development.
Step 2. Connect your Droid Bionic to your computer via micro-USB cable and make sure USB connection is set to “Charge Only”.
Step 4. Make sure you have drivers installed, you can check by going to Device Manager and you should have something like “MOT Composite ADB Interface”. If you don’t, download MotoHelper and install. Then plug-out and plug-in your phone.
Step 5. Double-click on “Run.bat” for Windows and for Linux or Mac type “./run.sh” in terminal. Rooting should begin.
Step 6. After couple reboots, your Droid Bionic should be rooted.
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You will need a rooted Droid Bionic to install all ROM/kernels.
How to Root Droid Bionic!