The other day, my JTAG broke, sadly. While my JTAG was working, however, I ripped a bunch of games from their respective discs onto my HDD, so they would load faster and are easier to mod.
Since my JTAG is now broken, I decided to try to play these retail games on my Dev Kit. When I run the game's default.xex from XexMenu, it says "This game is unable to start." I looked up why this would be happening, and apparently Devs will not run retail Xexs. So I obtained a fresh retail copy of the Xex I wanted to run (Halo 3's default.xex), and patched it with XexTool.
XexTool -md default.xex
XexTool -rm default.xex
That should patch the Xex to be able to be run on a Dev Kit, but it doesn't work.. The only thing that changes is instead of it saying: "This game could not start." it says: "Disc unreadable."
Some misc. facts about the console:
It is able to boot other homebrew xexs.
It's a Prototype Beta 2.
So, if anyone has any advice they could give on why this is happening and how to fix it, it would be very much appreciated.