You need to tell us clearly what you can and can't do. My current impression is this: (i) It can't read an SD card; and (ii) It can't attain either Mass Storage Mode or preboot mode via USB. If that's the case stop fussing with it and buy another unit because without SD card access or working USB it's useless.
If my impressions are wrong, you need to explain more to get further help.
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