Can my R6250 be fixed?

I have a Netgear R6250 & I updated Kong with "dd-wrt.K3_R6250.chk   2017-11-04 00:40   23M" from "http://www.desipro.de/ddwrt/K3-AC-Arm/".  What I did was reset the router to default then updated with the above & after it said it installed OK, I reset everything to default again when I got back into the router.

I thought it was fine until I looked at the top right hand corner & it said my version was from the 26th of June 2016, the update did not take for some reason.  Maybe because the above was a .chk file & not a .bin file.

So I went to here "ftp://ftp.dd-wrt.com/betas/" & got the latest .bin file which was "netgear-r6250-webflash.bin   26556 KB       7/01/2018".

I reset the router to default before flashing the router, I selected the install to "reset to default" after the flash was successful; I thought it would save me doing it myself afterwards manually.

It said the flash was successful.  I went to the URL & deleted the apply part so I am left with 192.168.1.1, but I could not get into the router.  I ran "ipconfig" but it did not show the routers gateway, so I turned off everything.

I powered up the modem & router & then the computer.  The first thing I noticed was that there was NETGEAR lit up on the router in white!  It never did that before with Kong.  The power light & the light next to it both lit up in orange & the wi-fi lit up in blue, the wi-fi & the other light only stayed lit for about 3 seconds, then they went off; another 12 seconds later the orange power light turned yellow or white (I have old eyes) & started to flash.  Still could not see the router with ipconfig.

I did the 30/30/30 thing a few times & it did nothing.  I held the wi-fi button & powered on & I did it when off & I did the same with the WPS button, still I could not get to the router.

I have not used this router for awhile as I was using another router but the wi-fi part died on it the other day when the power went off for half a minute, this router was not in use for over a year; I hope I have not destroyed it.

I clicked on the internet icon in the system tray & opened the network & sharing centre & it says "currently connected to an unidentified network - no network access".  ipconfig shows ipv4 address, subnet mask figures but no default gateway.

I am using a cable from the computer to the router.  I pinged 192.168.1.1 but it did not see the router.

I would be greatly appreciated if someone could help me fix my R6250, I can't afford to lose 2 routers in 1 week; I am using an ancient Belkin router from over a decade ago ATM (lucky I live in the bush).  thank you in advance for all the help