I found this write up on a different site. Sounds like a must for any "crack flashers".
"Have you ever bricked your phone and it ended up dying? That device probably ended up getting thrown away or put into your desk. Well, take it out! Team Black Hat has made an adapter that will give enough juice to your Motorola Device to get into Fastboot Mode/Bootloader. Now, this adapter can be used on other devices but it is advertised towards Motorola devices. Now, to the review part. Today, I decided to brick my old Razr by flashing onto it an incompatible boot.img by DDing it to the partition. Terrible choice by my part. The second thing I did was let this phone die. Whoops. Then thirdly, I tried my hardest to get it to turn on with a normal cord and what a surprised it failed. So, here comes my savior the Motorola Factory Adapter. This tool is the size of a nickel and attaches to ANYandroid cable. After I plugged the adapter into the cable, I put it into my phone and finally the computer. My Razr booted directly into Fastboot Mode and I was able to recovery my phone to factory settings. I highly recommended this product as there is not a simpler and cheaper solution available. I will post a link to this adapter at the bottom of the thread as my source!
Source- Team Black Hat"