One-click fastboot restore and root for the bionic v2.1 - xda-developers
Here is another great way to get your phone unbricked. This a newer version of the fastboot method suggested above. I've used it twice so far, once to actually unbrick my phone and the other time to return to stock so I could return the phone. Works very well, you don't have to download rsd or the recovery file, its all in one package. Just put the phone into fastboot, connect to a pc and run it. Easy as pie.
Also gives you the option to reroot afterwards too!