Ok, heres what you need: Grunt Modder http://halo.gruntmods.com/Files/Grunt%20Modder.exe A Rehasher (Grunt Modders hasher is too picky) 1gb USB Stick or larger Halo Reach Beta Film To Mod Computer with a USB Port and Windows XP Or Higher Ok, to start out, first you will need to update your Xbox 360, simply connect it to Xbox live and you will be prompted to update. After a semi lengthy update, plug in your Usb device and go to memory. Click on your Usb device, then select configure. Your 360 will format your memory stick. (If you have data it might be erased, so I suggest backing it up first.) After this is completed, go to your hdd and copy the film to your Usb. Then unplug the usb after this is completed. Plug the Usb into your computer. Start Grunt Modder. http://halo.gruntmods.com/Files/Grunt%20Modder/Pictures/tut1.jpg Click the tools tab on the grid and select the Hard-drive Icon. http://halo.gruntmods.com/Files/Grunt%20Modder/Pictures/tut2.jpg In the new menu that pops up, select "open device". http://halo.gruntmods.com/Files/Grunt%20Modder/Pictures/tut3.jpg Navigate the menu to the film clip you want, then right-click and hit extract.Choose a place to save it. http://halo.gruntmods.com/Files/Grunt%20Modder/Pictures/tut4.jpg Then, go to Tools>Game Tools>Halo:Reach Beta>Film Tool Don`t Use the grid to select it, the slot for the Film Tool opens the GTA IV editor for some reason, we will fix that soon. http://halo.gruntmods.com/Files/Grunt%20Modder/Pictures/tut5.jpg In the new menu that pops up, hit "Open File" http://halo.gruntmods.com/Files/Grunt%20Modder/Pictures/tut6.jpg Click a gamertag to edit it, then change any of the fields of text. http://halo.gruntmods.com/Files/Grunt%20Modder/Pictures/tut7.jpg In the menu, select "Save Changes" http://halo.gruntmods.com/Files/Grunt%20Modder/Pictures/tut8.jpg A message should tell you are done. http://halo.gruntmods.com/Files/Grunt%20Modder/Pictures/tut9.jpg In any rehasher, open the file and rehash, I choose Hash Block Calculator. In a future update, the rehasher in Grunt Modder will be improved so this step can be skipped. http://halo.gruntmods.com/Files/Grunt%20Modder/Pictures/tut10.jpg Go to utilities and open the con manager or, drag the file to Grunt Modder and it will open on its own. http://halo.gruntmods.com/Files/Grunt%20Modder/Pictures/tut11.jpg If the files already open from you dragging it, skip this step. Open the file using the menu option "Open File". http://halo.gruntmods.com/Files/Grunt%20Modder/Pictures/tut12.jpg Go to the menu option and select "Save and Resign" http://halo.gruntmods.com/Files/Grunt%20Modder/Pictures/tut13.jpg The Program will tell you are done. http://halo.gruntmods.com/Files/Grunt%20Modder/Pictures/tut14.jpg Go back to USB Xtaf Explorer. If you closed it, and didn't select close drive before, you will get this error on opening the drive: http://halo.gruntmods.com/Files/Grunt%20Modder/Pictures/tut15.jpg Just close Grunt Modder and open it again to fix it, next time use the close drive option. Navigate to the Halo Reach directory of your USB Stick and delete the old file. http://halo.gruntmods.com/Files/Grunt%20Modder/Pictures/tut16.jpg Then right-click and hit inject. http://halo.gruntmods.com/Files/Grunt%20Modder/Pictures/tut17.jpg When your done, hit close drive. http://halo.gruntmods.com/Files/Grunt%20Modder/Pictures/tut18.jpg Your Done! Plug the USB Stick into the xbox 360 and go to memory management on the dashboard. Delete the old file from the HDD and copy the new file onto it. Play the modded film! If you have problems, post them here or at the official support forum: Grunt Mods Support Forum