Restoring nexx wt3020 firmware

I installed padavan firmware in nexx wt3020 router expecting functionality enhancement but it doesn't seem to work..
i flashed using these commands

cd /media/sda/sda1
for i in 0 1 2 3;do cat /dev/mtdblock$1 > mtdblock$1.bin; done
mtd_write -r -e mtd3 write padavan.trx mtd3

Now i want to restore the original firmware.. i got hold of one bin file
Now, when i type the commands, they do not work..
Can some one help me?

/home/root # cat /proc/mtd
dev:    size   erasesize  name
mtd0: 00030000 00010000 "Bootloader"
mtd1: 00010000 00010000 "Config"
mtd2: 00010000 00010000 "Factory"
mtd3: 001156c0 00010000 "Kernel"
mtd4: 0067a940 00010000 "RootFS"
mtd5: 00020000 00010000 "Storage"
mtd6: 007b0000 00010000 "Firmware_Stub"

/home/root # mtd_write -r -e mtd3 write 3020-orig.bin mtd3
Could not open MTD device: mtd3

/home/root # mtd unlock mtd3
-sh: mtd: not found

Any help is appreciated. thank you..

Have you checked with the Padavan support yet? This is the OpenWrt forum.

Do you want to install OpenWrt?