R7000P Power light blinking red after firmware update

> I have tried to do the TFTP Client reload multiple times now with no
> success.

   "tried" or "no success" 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.

   Which "the TFTP Client" did you use, on what type of computer?  What,
exactly, did you do with it?  As documented, the TFTP firmware-load
procedure has multiple steps, with multiple items of user-supplied data,
and can be "tried" using multiple possible TFTP client programs.  That's
too many variables for "tried" to be a useful problem description.

> [...] Is there anything else I can do?

   A Web search for terms like:

      netgear  router  usb  serial  line

should find details on a still more complex scheme, with even greater
potential for problems.  I'd stick with the TFTP scheme (using a
command-line TFTP client program supplied with your OS), at least until
there's a better description of how the TFTP scheme was tried and
failed.