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I have a PRS-300 firmware prepared in much the same way. The flashing process is a lot simpler and seems like it will resemble PRS-505's in its recoverability. The only problem is that it hasn't been tested at all (I don't have a PRS-300 either, and nobody volunteered his), and that as far as I know, there is no official firmware update for PRS-300 so there really is nothing to re-flash with if this hacked firmware fails. In the worst case, the reader might become bricked until Sony releases a new firmware for it. Still, if you are feeling brave and (or foolish :-)), I would appreciate if you could PM me.
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