Since the lights flash constantly i think the sdcard is fine, but maybe the way he puts the files on the sdcard is wrong, the files need to be in the Sdcard directory itself, not in a folder whatsoever, I see a lot of people make this mistake, if files are correctly placed then using another Sdcard is the next best move.
All I want to do is underclock this PoS.
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Not sure if this modified firmware will allow you to underclock it, wait for thierry4wd to confirm.