The MOBI Reader software on the PocketBook is FBReader, which only reads DRM-free MOBI and so does not have a PID and can't be registered with MobiPocket. If you try to read DRMed (encrypted) MOBIs you will get garbage on the screen.
The fix is to strip the DRM, using mobidedrm.py - which if you use Calibre can now be added as a transparent pre-processor for MOBI and AZW (Kindle) input. You still need a PID when buying the MOBI book (and for mobidedrm), but this can be from Windows MobiPocket Reader or from any Reader app provided by MobiPocket (or from your Gen 3, if it is running the MobiPocket-based firmware).
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