Extracting firmware from devices using JTAG - sergioprado.blog
USB Blaster - JTAG tools to unbrick/debrick your router - YouTube
Hardware Hacking 101: Identifying and Verifying JTAG on a Device
JTAG pinouts - DD-WRT Wiki
USB JTAG NT and u-Link NT program Cisco M20 router - YouTube
JTAG Programmer, for COMPEX boards WP543 / WPE72 / WP546 / WP54 / WPP54 / WP18 / NP18. Jtag Programmer can be used to load in your loader and firmware.