Wrong FS Type during mounting the file-system (Yaffs2)

We are facing the following Issue. That is when we are trying to mount the file system, the following error is reported in the console

yaffs: dev is 32505861 name is "mtdblock5"
yaffs: passed flags ""
yaffs: Attempting MTD mount on 31.5, "mtdblock5"
usb 1-1.2: configuration #1 chosen from 1 choice
No filesystem could mount root, tried:  yaffs2
Kernel panic - not syncing: VFS: Unable to mount root fs on unknown-block(31,5)

    So i have booted my HHT with the secondary partition(/dev/mtdblock6) and tried to mount the primary partition (/dev/mtdblock5). While trying to mount the primary partition, the following issue is found.

    #mount /dev/mtdblock5 /mnt -t yaffs2

    yaffs: passed flags ""
    yaffs: Attempting MTD mount on 31.5, "mtdblock5"
    mount: wrong fs type, bad option, bad superblock on /dev/mtdblock5,
    missing codepage or other error
    In some cases useful info is found in syslog - try
    dmesg | tail  or so

  Since we need to recover the data from the primary partition, is there any approach to get resolved the above said issue?
Kindly help us in this regard ASAP.