I was quite amazed when I looked in my YouTube history. I remember watching some great videos about the Xbox and turns out most of them were made by the Modern Vintage Gamer:
https://www.youtube.com/watch?v=otysqrBT7ko - "The Original Xbox is still awesome - Softmod, BIOS Flash, Compact Flash HDD, Games, Emulators"
https://www.youtube.com/watch?v=lWGiHgTdLBc - "The Original Xbox is the Sega Dreamcast 2 ?"
https://www.youtube.com/watch?v=jR46e-HU06c - "The Original Xbox Debug Kit - How console games were developed in 2001"
https://www.youtube.com/watch?v=JFhpVzPd3Nc - "Online with the Original Xbox and XLink Kai in 2018, Play Halo 2 and more"
Another YouTuber who has created some quality content about the Xbox Classic is Metal Jesus Rocks:
https://www.youtube.com/watch?v=yZjzhtkn9DE - Xbox Collecting - Hidden Gems