yep, this should be the next step. Take a pin or needle and hold it as long into the "Reset-Button/Hole" (without much force!) until you hear the beep and see the red light. This should reset the Miner to factory settings. However, in case you have disrupted the upgrade process with unplugging it i'am not sure if this might be enough.... Hope so. Let us kow what happened and how things worked out.