stuck at M logo

You could wait a while (maybe 30 minutes, maybe until tomorrow) to see if anyone has any clever solutions, or you can spend the next 15 or 20 minutes sbf'ing .340 onto the phone and reapply the upgrade. I had to do it, it was my first time, and it was easy. There is a sticky with links to the downloads and instructions on the Rooting section of this forum.
 
Gotta hold down the power and home button till you get the triangle android guy then press the volume buttons to get into recovery. It changed from froyo to gb.

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