The long way to RGH3: Xbox 360 Security in Details
By: Alexey Shalpegin
An excellent, ultra-in-depth write-up by embedded security expert Alexey Shalpegin about the Xbox 360's security and defeating it, specifically development of the RGH methods.
Link: https://swarm.ptsecurity.com/xbox-360-security-in-details-the-long-way-to-rgh3/
Hacking the Xbox: An Introduction to Reverse Engineering
By: Andrew "bunnie" Huang
This is a book written by bunnie, the first person to hack the Xbox, detailing how he was able to circumvent Microsoft's multiple efforts at securing the console.
Link: https://bunniefoo.com/nostarch/HackingTheXbox_Free.pdf
The Early History of Wii Modding
By: noobwarrior7 of GBAtemp.net
This article describes the history, early attempts, and later issues with Wii modding. Worth a read if you're interested in embedded security, and it's not too long.
Link: https://gbatemp.net/threads/the-early-history-of-wii-modding.243461/
MIT: History of Hacking the Nintendo 3DS
By: Shavina Chau, Joonho Ko and Jessica Tang
MIT published a paper that describes some of the data structures of the Nintendo 3DS, and also how they were able to defeat the ARM11 security (sort of) so homebrew and unsigned code can run.
Link: https://courses.csail.mit.edu/6.857/2019/project/20-Chau-Ko-Tang.pdf