Item description:

This tool will remove restrictions that are on the xex (Xbox 360 executable) format for Halo Reach. A list of the current features are...

Remove HashSec check to mod the ini and TOC files.

You will need xorloser's xextool.exe in the same directory as this application.

NOTE: This only works on development kits, or jtags. This will not work if you are on a flashed/unmodified console.

If you happen to get the "Invalid Checksum" message, you can try running MOHUnlock 1.0 (only) with the argument -ignore. The easiest way to do this is to create a shortcut to MOHUnlock then right click, properties, then at the end of the target it should be like
...MOHUnlock1.0.exe"

Just add -ignore to the end of it so you have
...MOHUnlock1.0.exe" -ignore

and it should disable the MD5 check.