Unfortunately no one can be told what fun_plug is - you have to see it for yourself.
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Could someone please create a dump of original U-Boot from DNS-325?
#nanddump /dev/mtd0 > /mnt/HD/HD_a2/mtd0.bin
Ideally, I would also be happy to have two of these partitions:
#nanddump /dev/mtd4 > /mnt/HD/HD_a2/mtd4.bin
#nanddump /dev/mtd5 > /mnt/HD/HD_a2/mtd5.bin
I've stuck with recovering failed flash