How To Mod Tony Hawk's Pro Skater HD (Xbox 360)
(Basically the how-to-fix the checksum, minus fixing an actual checksum!)
Tutorial by: TNT
http://tnthps.us

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Tools needed:
A USB Stick OR another method of transferring saves from your Xbox to your PC
Horizon (To transfer save data)
Hex Workshop (To modify save data) (The trial will work fine!)
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1. Put your USB Stick into your pc and open Horizon. Find your THPSHD save, and extract it somewhere on your pc.

2. Drag and drop the copied file into the gray area in horizion. It will open the following screen, click Contents (circled below):



3. Now extract the file from the contents, as this will be the part we open in hex workshop.



4. This is the step in which you would refer to the other tutorials and do all of your modding work... I'll wait, just come back to step 5 when you're finished.

5. Now that you're completely finished with the mods, save your file. Now, in Horizon, right click that same file you just edited, and click 'Replace' (It's right under the 'Extract' button you just used.)

6. Now click 'Resign & Rehash' and then click 'Save to Device' and then overwrite your original save. Load the game and enjoy!

Note: This game pushes the tenth year I've been modding the THPS Series. http://TNTHPS.us