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When I navigate to /mnt/HD/HD_a2 I only see the FFP dir and the shares I have created, but no OEM OS files.
How did you get the funky icon though? Mine still shows a dodgy screen icon.
To make this excercise survive reboot, you would need to find where /etc/avahi/services is stored on FLASH device and copy the file there (should be quite along the lines of store-password.sh from nas-tweaks), but I haven't bothered with this yet. I keep my NAS on 24/7.