XR500 Nighthawk - Flashing power light - Firmware issue?

Hi all, 

Hoping someone might be able to help as I'm currently at my wits end with my router and Netgear! I've seen this problem floating about in several discussions but i've tried everything to remedy the issue but to no avail. 

I've got the Nighthawk XR500 Gaming Router currently displaying the problem of the power light blinking. I'm not sure how this has come about however after a quick search on the internet and in the forums it sounds like there is a firmware issue. 

Once i had diagnosed it i tried several times to re-install the firmware using the tftp2 method however when i start to flash the drive the blue progress bar gets halfway and says that there is an issue connecting to the server. I'm having to hotspot off of my personal mobile in order to download the firmware files which is less than ideal. 

I've contacted Netgear's "support" and spent 45 minutes on the phone re-diagnosing what i already knew to be told that i would have to pay around £100 to get further support even though I've got hardware warranty on the product! Sent a complaint email to them which has been ignored so I'm not sure what else to do with a router i've spent in excess of £250 on other than throw it in the bin...

Hoping someone might be able to point me in the direction of a fix! 

Thanks.