I am using Buffalo WLAR-L11-L (802.11b, 4-port hub, NAT box) that was running firmware 1.01 happily. I tried upgrading to firmware 1.31 to get PPTP passthrough capability. After this, I tried setting a WEP key. The box tried to restart, and now gives the two-flash red DIAG light indicating a flash ROM error, which persists after the power-off-on restart. Is there any way to resolve Buffalo Wireless Router flash problem?
To resolve Buffalo router flash ROM problem, reset your router to factory defaults.
Step 1- Press and hold the reset button at the back of the Buffalo router for 30 seconds.
Step 2- Disconnect the power from the router while continuing to hold down the reset button.
Step 3- After few moments, reconnect the power.
Step 4- Now hold the Reset button for 30 seconds.
Step 5- After 30 seconds, release the Reset button and wait approximately 1 minutes for the router to re-initialize itself.
By performing above steps, your Buffalo router will reset to its factory default state, which is sometimes needed to get it to boot properly after a flash. If that doesn't work, then you'll need to look into one of the more advanced recovery procedures.
Also, update your Buffalo router firmware on a regular basis. Bookmark the page where your router has updates posted and check it every so often for new versions of the firmware.
Still facing any Buffalo flash issue then call at Buffalo Router.