On lesson JTAG 3: Interacting, there’s a line that reads:
Continue with the hardware setup we prepared in JTAG Lab 2.
Where JTAG Lab 2 is a link to
https://learn.securinghardware.com/courses/applied-physical-attacks-1/lessons/jtag/topic/jtag-3-interacting/
I assume that the intention was to link to
https://learn.securinghardware.com/courses/applied-physical-attacks-1/lessons/jtag/topic/jtag-2-enabling/