Preparation
Download pumpKIN http://kin.klever.net/pumpkin
Download OEM User-Friendly firmware (7-Nov-11 1.79) http://buffalo.jp/support_ap/support/products/wzr_hp_g300nh.html
1.Connect the computer to the router with ethernet cable while the router remains turned off.
2.Settings->Network & internet Ethernet->Edit ip settings
Enter these values:
IP address 192.168.11.2, subnet mask 255.255.255.0, default gateway192.168.11.1
4.then turn off firewall go to Control Panel\Network and Internet\Network and Sharing Centre click on windows firewall then
choose "turn windows firewall on or off" then click on every "turn windows firewall off" box.
5.Open a Windows command prompt as Administrator. type cmd in the search box from Start menu, then press Ctrl+Shift+Enter. You will be prompted with the User Account Control dialogue choose yes. OR just right click on CMD and choose run as administrator.
Type the command
route print
to get a list of your NIC(s). Write down the interface number for the LAN card, in my case, it's 9, you may need to scroll up. mine is the first one "Intel(R) Ethernet Controller I226-V"
6.Now type the command below to get the ARP binding
Replacing the number 9 with the interface number
netsh interface ipv4 add neighbors 9 192.168.11.1 02-AA-BB-CC-DD-1A
7.Run pumpKIN utility choose "Put File"
8.Put 192.168.11.1 as remote host, local File is wzrhpg300nh-179
9.Click "ok" and quickly turn on the router. (within a few seconds)
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After 5-10 minutes, turn the router off and on.
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Type the command below to delete the ARP binding
netsh interface ipv4 delete neighbors 9 192.168.11.1 02-AA-BB-CC-DD-1A
"Buffalo WZR-HP-G300NH's U-Boot defaults to IP 192.168.11.1 with MAC 02-AA-BB-CC-DD-1A, do not replace the MAC address with the MAC address on router label"