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Solved
WNDR4500v2 Router Recovery Using UART Serial Converter
For an unknown reason, the WNDR4500v2 Router has stopped working correctly. I am also unable to access settings on 192.168.1.1, routerlogin.net, routerlogin.com, or via NG Genie App (PC). I suspect t...
According to the few pictures I found, you shouldn't need to do any soldering. The serial pins should already be soldered onto the board. This page has the pinouts.
Most USB to serial TTL adapters use 1 of 2 chipsets: FTDI and Prolific. Either brand of chipset should work. I think I have a Prolific-based adapter. Just be careful about not getting a knock-off. It's amazing that knock-offs exist for something so cheap.
I have successfully de-bricked the router using a FTDI FT232RL USB to TTL Serial RS232 Cable, and commands: 'cfe> nvram erase' & 'cfe> flash -noheader : flash1.trx' via 'Putty' and 'tftp2.exe'. Happy days! Thanks.
I am not able to give kudos to your message AndyOxon so I just want to thank you, I succeeded to unbrick my router too!
Excellent!