R6400 crashed during firmware update bricked itself

> Model: R6400|AC1750 Smart WiFi Router

   Is that accurate?  R6400 or R6400v2?  Look for "Model" on the product
label.  Firmware version (if known)?  Connected to what?

> [...] the power light is white and flashing. [...]

   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 cant reinstall the firmware because its not connecting to my
> pc on a wired connection. [...]

   "can[']t" is not a useful problem description.  It does not say what
you did.  It does not say what happened when you did it.  As usual,
showing actual actions (commands) with their actual results (error
messages, LED indicators, ...) can be more helpful than vague
descriptions or interpretations.  "because" is open to dispute.  What's
your evidence?

> [...] it just has a red light on whatever ethernet port i plug it
> into. [...]

   "red" or "amber"?  An amber port-status LED is hardly fatal.

   Visit http://netgear.com/support , put in your (actual) model number,
and look for Documentation.  Get the User Manual.  Read.  Look for the
LED descriptions and "Troubleshoot".  Further reading might not hurt,
either.

> [...] so [...]

   See "because", above.

> [...] i cant assign a ststic ip address and reinstall firmware.

   How, exactly, does any LED color stop you from configuring the IP
parameters on the Ethernet interface on your (unspecified) computer in
any way you might wish?

   Note: "cant" is a word, different from "can't".