Restoring Firmware

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Fixing a bad flash

I recovered a used Zyxel unit purchased from amazon using this method after some experimentation.

If your zyxel unit does not boot: Symptoms are booting up - no network connection - and green flashing LED on front that just keeps flashing forever.

Also Try the USB recovery method first. If that does not work - then your unit may have a corrupted NAND.

The best way to detect this is with serial cable. On bootup if it gets stuck on Stage2 after the kernel - with the error in the serial terminal:

      • Stage 2: Prepare the root file system ***

Mount system partition... yaffs: dev is 32505862 name is "mtdblock6" ro yaffs: passed flags "" uncorrectable error : Disk /dev/sda doesn't contain a valid partition table bsname}: no internal volume available 1

If the internal mmcblk partition is corrupted. When this happens the boot will not get past stage two. You can do the following over serial - or using a keyboard - but using a keyboard you may not be able to see if you typed an error.

First download the recovery file and unzip to the root of a fat32 formatted usb key: from: [1]

Now either over serial or with a usb keyboard type the following:

mkdir /mnt/parnerkey

mount /dev/sdb1 /mnt/parnerkey/

cd /net/parnerkey/nsa310_fw/


If things go well your unit should shutdown - turn it back on - and things should be working!