Help Funbook : cannot create /dev/block/nandg: Permission denied

[d3b]

I finally goy my fun book today.. Enjoying it.
But I can't backup the stock rom, there is option for restoring, but no option of backup...
These are the options I'm getting...
1.reboot system now
2.apply update from external storage
3.wipe data/factory reset
4.wipe cache partition
5.apply update from cache

When started by pressing Option+On , a menu comes up..

Android system recovery<3e>

Android system recovery utility (EVP: vol up/vol down, home, enter)

reboot system now
apply update from external storage
wipe data/factory reset
wipe cache partition
apply update from cache

3. Go to Play Store and download Superuser.
4. Go to Superuser App > Settings > Su Binary > Install the Binary
5. Reboot.

I downloaded Superuser v3.0.7 (41)
I went to the round icon on the upper right, then, under General, updated the Su binary v3.0.3.2. Is it that what is needed?

When I'm running recovery-install.bat , its giving me 'access denied' messages(ran with admin privilege, updated drivers as instructed)

adb shell "cat /data/recovery.img > /dev/block/nandg; sync"
/system/bin/sh: cannot create /dev/block/nandg: Permission denied

I changed permission of the /data and /dev folder manually by "Root Browser". Couldn't change permission of /dev/block/nandg
. Also tried from adb shell, no permission allowed.

Mayb it a problem with new funbook tablets.