I tried to update my r690v2 software and now my power button is blinking

> [...] now the power button is blinking

   If cycling power or pressing the Reset button for many seconds
doesn't help, then you may be a candidate for the TFTP recovery scheme.
See, for example:

      https://community.netgear.com/t5/x/x/m-p/1622096#M102004

> I was setting up my router on my phone after some one in my family
> factory reset it and when I started to update the software [...]

   "update" how, exactly?  Recurring stories like this have persuaded
many people that manually loading firmware over an Ethernet (wired)
connection is more reliable than any automatic or wireless method.  If
you can get it working again, the manual procedure follows:

   Visit http://netgear.com/support , put in your model number, and look
for Downloads.  (For older versions, under Firmware and Software
Downloads, look for "View Previous Versions".)  Find the kit(s).
Download the kit(s) you want.  Read the "Release Notes" file for
instructions.  (In the User Manual, look for "firmware", and,
especially, for a topic like "Manually Upload Firmware to the Router".)

When that fails because of a deficient User Manual, try:

      https://kb.netgear.com/23960