So, I've completely re-done this tutorial... The reason for this is... the first one was kind of... Well... Half Assed I didn't put much effort into my method and the results were kind of inconsistent. I spent today dumping all of my games, looking for the headers and seeing what works.. Enjoy The new tut. Also, The cheapest game available that is guaranteed to work with powersaves is Steel Diver, it is available new on amazon for very little Requirements: Powersaves 3DS A Game Cartridge* HxD (Freeware) * Disclaimer (Important) If your game, once inserted into powersaves acts like it has been removed and placed back into the powersaves dongle (Constantly refreshing the save list and displaying unsupported game) THIS WILL NOT WORK WITH THAT GAME By following this method you WILL LOSE YOUR SAVEGAME for the all the rom's you apply your header to, the only way to keep them is to use NTR CFW and the savedata plugin to backup the save beforehand, and then to restore it after you have applied your header. (alternatively you could use savedatafilter if you have a 4.X cfw compatible console) Methods: There are two methods I've found, one seems easier but the other seems more reliable (The methods are now in the spoilers below this sentence) The First and more reliable method Powersaves Steps Step 1. Navigate to /USERNAME/Powersaves3DS and MOVE all of the .bin files to another folder Step 2. Open powersaves and create a savegame backup of the cartridge you want the unique ID from. Step 3. Close powersaves, then open powersaves, then minimize it. (Yes this necessary, and the powersaves dongle and cart must remain plugged in while doing so) HxD Steps Step 1. Open HxD, Press Shift+Ctrl+R and open the ram for PowerSaves3DS.exe Step 2. Press Ctrl+F and search for "gbatemp).bin" Step 3. Look in the hex byte area for 00 00 00 88 Your unique ID will be the 16 hex bytes after that and has 48 FF bytes after it. (Like This) Here's the gif for the hxd steps: The header may not be in the same place as mine, could be above or a little below... in every instance that I've seen it has been in view of the .bin file we searched It ALWAYS has 88 Before it, and 48 FF bytes after Once you have your unique header info you can use it for your backups. Also, you should probably move your saves back to the powersaves folder Troubleshooting: Cant Find 00 00 00 88: The header may not be in the same place as mine, could be above or a little below... in every instance that I've seen it has been in view of the .bin file we searched It ALWAYS has 88 Before it, and 48 FF bytes after Things to try: Try a different computer, some users were unable to locate their header on their PC, they tried with a family members PC and it magically worked. There are rare instances where it does not start with 00 00 00 88 it will start with something random like 00 57 A5 88 But ALWAYS 88 and followed by 16 FF bytes People who've had success DarkFlare69 - Mario Kart 7 iamBlux - SuperSmash Bros. (USA) xjoelx - Pokemon Y Osmosis xile6 juggernaut911 - Steel Diver Method Two, The easier less reliable one Also, This time I made a video instead of using .gif's Steps: 1. Insert Game Cart into Powersaves dongle 2. Open powersaves 3. Open HxD 4. Press Shift+Ctrl+R 5. Double Click "PowerSaves3DS.exe" 6. Press Ctrl+F and search For the text string Code: name="Id"; filename="id.bin" 7-1. In the hex byte window (on the left) around 2 lines down from highlighted stuff are the bytes 0D 0A 0D 0A 7-2. The 16 groups of two characters (hex bytes) after 0D 0A 0D 0A is your unique cartridge ID (private header) 7-3. After your private header there will be 48 FF bytes. Troubleshooting: Finding it difficult to understand?: Take a look at the video! Cant find: name="Id"; filename="id.bin": I got those errors once or twice, your best bet is to close powersaves and hxd, open powersaves then open hxd again. It's kinda hit and miss, but its more reliable than the other method. Games That I Tested This Method With: Working: Pokemon Y New Super Mario Bros. 2 Harvest Moon 3D: A New Beginning Luigi's Mansion: Dark Moon Scribblenauts Unlimited Not Working: Cubic Ninja Farming Simulator 14 So, you want a .bin file? If you want to make a .bin of your header (Which you should do) This is a blank template file, Follow these steps.. 1. Open this .bin with HxD 2. Paste your unique ID as the first 16 bytes 3. Save the file. I use my header and get error 002-0123: If you're getting the error 002-0123 when using a rom with your new header, take a look at this thread: https://gbatemp.net/threads/why-sky3ds-gets-002-0123-even-with-a-private-header.385672/ How do i fix it? 1. Open Sky Army Knife 2. Select latest template file 3. Select the rom that is giving you the error 4. In the "Cart ID" section, change the manufacturer 5. Click "Save to .txt" 6. Open diskwriter, and select our modified template 7. Delete rom from your SD with diskwriter 8. Re-write the rom with the edited template we made 9. Cycle through the games on your sky3ds so that it refreshes 10. Play Game (If you still get the error, Repeat steps 4 to 9 but change the manufacturer to something DIFFERENT) My Savegame is corrupt: You, should have read the disclaimer. Suggestions Get These Tools: Sky Army Knife - By Foxi4, A multi-tool for Sky3DS users. (Used for changing various parts of the template for each game) No Ban Sky - By hackotedelaplaqu, patch all games in the template file with your unique ID.