I recently installed 6.39 - b9 CFW on my PSP and it worked great but suddenly
yesterday when I turned it on the D - Pad,Home, Start, Select and Action buttons became unresponsive in XMB after I turned it on.
(Screen works fine)
(Volume +/-, brightness and mute buttons works)

I turned it on while holding R key so it entered to recovery menu but couldn't scroll through it.
Soon after I let go the R key while in recovery it automatically goes to XMB and still the keys don't work.

I removed the battery and reinserted it and turned it on, still the keys don't work, now in the date/time setting menu.
Also removed the memory stick and tried but the same prob.

what should i do?

My PSP details:
PSP model - 1001
OFW installed - 6.39 b9

Help me in this issue, much appreciated.
Thank You.