i have a demo mode ps3 and am going through the same thing and it is not possible to change the firmware to a retail version... the firmware is stored on the flash memory in the unit not the hdd and when you try and force it a retail firmware it doesnt recognize it... the only reason why they allow you to unlock it is to update the firmware... so it would be poiintless for sony to let you unlock it and install a new firmware. if anything comes up let me know.
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