My router CFE was over written. I have searched for the last two weeks for pinout JTAG on this router. I have a back up of the boot mtd0 to reflash.
The tftp method will not work since CFE needs reflash, also tried nmrpflash.
I have an esp8266 working on setting up WiFi JTAG programmer. Sine mainly working fro! Laptop I have Linux or windows. If you know another programmer, software or cable to buy.
Only times I see JTAG mentioned with this or the R7900 is asking for pinout and no response or they are mistaken and calling the serial 4 pin a jtag.
thanks for any help.
Did you look here:
https://www.myopenrouter.com/article/how-set-serial-console-netgear-r8000
There are photos of the headder on this page. I hope this helps.
Tex-Hogger
Did you find a way to do flash the bootloader? (CFE).