I don't think you can backup firmware from this type of players. you have to obtain good firmware and flash it to the player. While backup process many players became dead for me. From the experts i understand that to back up 3052c firmware, you have to remove main chip and replace it with 3052B and then backup. you can obtain good working jxd692 firmware from internet. I already flashed many players of jxd661+, 691, 699 etc and working good.
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