Cannot boot my R-7500

Hi,

So I decided to try out the Openwrt firmware but now the router doesn't boot so I am currently stuck.

I found out that one could flash the stock firmware through tftp, I suppose the one that ends with an .img?

I downloaded it from Netgear support site.

Nothing seem to happen.

In the tftp client I enter

192.168.1.1 as the server and as for the password, I just type the word password and nothing else.

Am I missing something?

The tftp client doesn't get any response from the router.

Any tips on what to do now?

Many thanks!