First of which is encryption. Nearly all files on an Xbox 360 game disc as well as the Xbox 360 hard drive are signed with Microsoft’s private key. If anything in these files, even just a single bit, is changed, the signature is broken and the Xbox 360 refuses to run the file. The second security measure is media locking. The default.xex (game executable) is restricted to run only from a certain type of media. For example, all Xbox 360 games are restricted to run only from “Xbox 360” media. Before the firmware hacks, if you were to copy an Xbox 360 game and try running it from “DVD+R DL” the Xbox 360 would obviously see that it wasn’t “Xbox 360” media and refuse to run it because of the media restriction.
Textbook’s Xbox 360 Firmware Tutorial from 360mods.net
Download Hacking the XBOX 360 for Noobs Tutorial
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