Add source code from ABadMemUnit for HDD version

[Copilot]

This PR adds the complete source code structure to the aBadHDD repository, making it available for those who want to use the Bad Update exploit on Xbox 360 internal HDD instead of Memory Units.

What's Changed

The repository now includes all source files from ABadMemUnit:

Source Structure Added

• Common/ - Shared assembly files including gadgets, kernel configs, and payload cipher text handling
• Stage1/ - First stage exploit files supporting three game variants:
  • Avatar
  • Rock Band Blitz
  • Tony Hawk's American Wasteland
• Stage2/ - Second stage exploit assembly code
• Stage3/ - Third stage exploit including the ObjLink C# tool for linking object files
• Stage4/ - Fourth stage exploit and hypervisor data cleanup
• build_exploit.bat - Windows batch script for building the exploit
• Binary files - Essential pre-compiled binaries (update_data.bin, xke_update.bin)

Documentation Updates

• Enhanced README with project structure overview
• Added usage notes and important warnings
• Included references to related projects (ABadMemUnit, ABadAvatarHDD, original Bad Update)
• Clarified that source may require modifications to compile

Notes

As mentioned in the issue, the source code may require modifications to compile properly. Users looking for a ready-to-use HDD version should see ABadAvatarHDD-rain2591 which provides hex-modified binaries ready to transfer.

This repository now serves as a source code reference for the HDD variant of the Xbox 360 Bad Update exploit, complementing the Memory Unit version.

Related Projects

• ABadMemUnit - Memory Unit version
• ABadAvatarHDD - Ready-to-use HDD version
• Xbox360BadUpdate - Original exploit by grimdoomer
• ABadAvatar - Avatar-based variant

Original prompt

This is here for folks want in on it and don't have an MU. Just transfer and you're good to go. I don't have source for this, i thought they had fixed source but they didn't lmao, i don't feel like fixing it myself, again, to get it to compile

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