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So the original firmware is called PP5020.mi4?
Does the rockbox logo (it should display quickly before the debug info) look right? For example, the greys aren't inverted (light=dark)?
Does the original firmware load? You'll need OF.mi4 in the System\ directory and you'll need to delete or rename any .rockbox directories.
If you switch on the hold switch after the Samsung logo shows, but before the Rockbox logo, does it say "Hold switch on. Shutting down...." and then shut down?
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