Power white Light blinking after firmware update

> I was doing the firmware update from 0.9.34 to the 0.9.42 [...]

   "doing" how, exactly?  "0.9.34" or "1.0.9.34" (and so on)?

> [...[ I did the reset by pressing the reset botton 30 second and plug
> in power back and no luck.

   Not a clear description of what you did, or what happened when you
did it.  I'd expect the reset button to have a greater effect when the
router is not powered off.
 
   Visit http://netgear.com/support , put in your model number, and look
for Documentation.  Get the User Manual.  Look for "Factory Settings".

   You may be a candidate for the TFTP recovery scheme.  See, for
example:

      https://community.netgear.com/t5/x/x/m-p/1622096