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If I understand correctly, you overwrote the /dev/mtdblockX files with the ones you copied from someone's Western PRS-650 using ebook_msc put.
I am glad it worked for you, but it was (1) risky, as you were overwriting the Root filesystem while running from it (could have crashed and killed your reader) and (2) somewhat unethical, as you essentially cloned someone else's reader together with serial number and DRM authentication.
Wouldn't recommend doing it as a routine conversion exercise.
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