Hello, >with the power plugged in. If you have the power plugged, try >to remove it (just have the 770 battery enough charged). Indeed, I usually have power plug disconnected when I flash, I work with the battery alone, because it is fastest to also reboot by dropping the battery away (I have opened the battery compartment already when I start, so I can just tap the device and the battery drops to my left hand). Best Wishes, Karoliina http://www.karoliinasalminen.com/blog
