I had this problem before and I received an e-mail file sent by MyGica. I received instructions to place the file in the root of the flash drive, connect the power and wait for the update. Was solved. I do not have the update file.
I have a device from a friend who needs this update, because some captured videos are corrupted.
I have another unit that is another problem, only the green light indicating power comes on and not respond to any commands, and no sign on the TV.