I had this happen to my razr. I was messing around and started the fastboot files but they never finished so I was stuck in fastboot mode. Nothing worked. I could not switch to recovery or anything. Problem was after messing around, my battery was too low to even try to run fastboot again. And unfortunately, in that state the battery will not charge no matter what you do.
So, what I did was.... take off the back cover to expose the battery. At the bottom of the phone was a rubber thing covering the positive and negative terminals (basically little screws with a "+" or a "-" ). I took an old charging cable and cut off the end that plugs into the phone and then peeled back the rubber tubing. I then found the black and the red wires and stripped a small portion of the covering. Then I placed the red to the + screw on the back of the phone and the black wire to the - screw. I had to use tape to keep them secured. Plugged that cord in to the wall as if charging. This provided the juice needed to power up the phone. Then since my phone could only load up in fastboot mode, I just connected it to the computer with my good cord and used rsd to fastboot. Worked perfectly. Then of course I just put everything back the way it was.
Of course this is just my personal experience to fix it. Since the op has a 910, I don't know what sort of differences there are but to my knowledge the fastboot files are out there for the 910.
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