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Question If there is a power surge during the upgrade (some times things happen when you least expect them) will the G-Major work like before when the power comes back or will it be useless

Answer
The software is writen into a buffer until the G-Major has received a full valid dump. It doesn't reprogram its memory before it has accepted the new software. Therefore, the G-Major will not lose the old software if the dump is interupted.