This is a step my step thorough instruction on how to mod your gamerscore!

Required: Xport 360, Program Editor, Transfer cable (Xsata or memory unit)

1st. Open up Xport 360 and open your hardrive up.

2nd. Go to your profile (probable one with most games and should start with "E")

3rd. Open your profile and click the first one (starts with "F")

4th. Click open the 000010000 folder and it should show your profile on top right.

5th. Drag and drop your profile on your desktop (make sure uac is off, tutorial on youtube)

6th. Open up Profile editor (run as admin) and click the xbox icon on the top left.

7th. Click open and scroll through your desktop programs till you see the “E” page and open it.

8th. It should pop up a bunch of games that you have played on your account before click the one you want to gamerscore mod.

9th. After clicking the game go on the bottom right and click the offline bubble than click unlock all offline. Then click yes to the popup.

10th. After done with gamerscore mods go to the top right click the xbox icon click save (twice to be sure.)

11th. Click close and reopen Xport 360, Drag and drop your modded profile from your desktop back to where you took it from Xport 360 and click yes to all to the pop up.

12th. Your all finished just wait for it all to load after dropping profile in Xport 360. Put your harddrive back in your Xbox 360 and enjoy!
Please post below if I left something out or any questions!
+ Rep if you like my Tutorial!