Netgear R7900 possibly bricked after flashing OpenWrt 21.02.3

[elder_tinkerer]

@fangq

is there any other ways to connect or re-flash the router?

Yes, there is. Get yourself a TTL-Serial-to-USB-cable, open the router and connect the router via the cable with your PC.

It's said that the R7900 and R8000 are quite similar, so maybe this would help:
https://www.myopenrouter.com/article/how-set-serial-console-netgear-r8000

Also, please refer to:

Is there a way to unbrick an r8000?

I've flashed june 03/17 firmware and somewhere during the process I believe my router bricked. On windows I tried tftp but the router was unreachable. I am not able to ssh into the router and when using ping I get host is unreachable. I do have an adafruit console cable to use. I also own an r7000 which also bricked and there is an unbrick guide on another forum. Would the steps be similar for the r8000? Would there be anyone willing to do a write-up?

and

Serial Console

I do hope it helps a bit.