You need a JR Programmer v2, and a Ace v3.
Here are the install points for both:
https://i.imgur.com/Rv4SR0r.jpg
A pretty simple tutorial would be:
Use the JR Programmer v2 to get two nand reads.
Create and write the ECC to the console.
Solder the Ace v3.
Boot the console and get your CPU Key...