Flash between DD-WRT and official firmware on WZR-HP-G300NH

Flashing DD-WRT on this router is extremely easy now -- thanks to the hard work of DD-WRT developers and the officially partnership with Buffalo.

Flash from the stock firmware to DD-WRT
*Use releases after r14402 to be safe as earlier releases had some problem with certain WZR-HP-G300NHs and might brick the router(can be recovered).

Goto DD-WRT Router Database and type WZR-HP-G300NH in the search box. There are two files listed:

• buffalo_to_ddwrt_webflash-MULTI.bin
  This is used to upgrade from stock firmware to dd-wrt, which includes an encrypted file header to make it compatible with Buffalo's official web upgrade page. Use it when flashing from stock firmware to dd-wrt.
  
  
• wzr-hp-g300nh-dd-wrt-webupgrade-MULTI.bin
  This is for future update from a DD-WRT loaded router.
  

The upgrade process is very straightforward and there is really nothing to elaborate here. Just load buffalo_to_ddwrt_webflash-MULTI.bin on the firmware upgrade page then wait patiently. Also note that the router's IP will change from 192.168.11.1(Buffalo's stock firmware) to 192.168.1.1(DD-WRT), use DHCP or set the static IP accordingly.

Revert DD-WRT to stock firmware

DD-WRT for this router is still in early stage so one might want to back to the stock firmware. We can always go through the bulletproof TFTP route but if you just need to revert from DD-WRT, there is a shortcut.

1. Download this modified Buffalo firmware(mirror download)
   Its a stock 1.65 firmware and has been modified to work with DD-WRT web upgrade interface. The firmware is on DD-WRT forum and you'll need to register to download it. Or you can download from the mirror link without registration.
   
   
2. Load file wzrg300nh_original.bin within DD-WRT web upgrade page to do the conversion. Be patient, it longer than usual and will take like 5-10 minutes.
   
   
3. After reboot, router's IP will change from 192.168.1.1 -- if you're using DD-WRT's default -- to 192.168.11.1.
   
   
4. The router will now have firmware 1.65 loaded and you can upgrade it to newer release from this point. Save wzrg300nh_original.bin for future use if you're about to try DD-WRT(again)