If you have installed OpenWrt Backfire on your Asus WL-500g Deluxe and want to restore the factory firmware than this guide is for you.

Software on router before

Software on router after

Host operation system is Fedora 19 (64 bit).
If you are not using Fedora 19, you should virtualize it:
Installing Fedora 19 (64 bit) in VirtualBox

I presume that you can communicate with your router.

Preparations

1. Go to Asus Support site: http://support.asus.com/download/
   Type “wl-500g deluxe” in Model Name Search box
   Click Search
2. Click “WL-500g Deluxe”
   
3. Select WinXP as OS
4. Click Firmware
5. Click “Global” in the Version 1.9.6.0 frame to download the firmware
   If it doesn’t work here is a copy of it one my site: WL500gx_1960_EN.zip
   
6. Decompress the firmware

   $ unzip WL500gx_1960_EN.zip

7. Check firmware checksum

   $ sha1sum WL500gx_1.9.6.0_EN.trx

   It should return:
   a273a7e7c5278d4eb76c53c20492a772187ced59  WL500gx_1.9.6.0_EN.trx

Firmware update

1. Copy this file in the router

   $ scp WL500gx_1.9.6.0_EN.trx root@192.168.1.1:/tmp/

   Note: My router IP address is 192.168.1.1, change it to your router IP address in all commands

2. Login to your router

   $ ssh root@192.168.1.1

   Enter your password.

3. Write the firmware to flash

   root@OpenWrt:~# mtd -r write /tmp/WL500gx_1.9.6.0_EN.trx linux

   

4. Wait until “Rebooting …” appears
   Note: If you have configured your router as an OpenFlow switch before using my guide than you have to pull out the LAN cable from WAN port now and plug into a LAN port (eg. LAN1).
5. Go to http://192.168.1.1 in your browser
   

   user:	admin
   password:	admin

   Press Enter

   

Congratulation! You have just restored the original firmware.