Gpd pocket 2 showing ssd empty in bios , I can install windows to it via an sd card but after a hard reset it will no longer boot into windows , the drive is healthy and I have written to it when windows is installed, any ideas?

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gpd pocket 2 showing ssd empty in bios , I can install windows to it via an sd card but after a hard reset it will no longer boot into windows , the drive is healthy and I have written to it when windows is installed, any ideas?