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)

Spoiler: 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

Spoiler: People who've had success

DarkFlare69 - Mario Kart 7
iamBlux - SuperSmash Bros. (USA)
xjoelx - Pokemon Y
Osmosis
xile6
juggernaut911 - Steel Diver

Spoiler: 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

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.

 

[4ur0r]

Was waiting for this for a looong time. Thank you very very much.

I think I will buy this one: http://www.amazon.it/Datel-Action-R...TF8&qid=1427726943&sr=8-1&keywords=powersaves can you tell me if it's compatible?

 

[LameNobody]

Was waiting for this for a looong time. Thank you very very much.
Also, is it working with every verion of the powersaves in every region?

I don't see why it wouldn't.

But, I guess you'll find out.

 

[4ur0r]

I don't (yet) own a powersaves dongle.
Just one more question: since it seems the trick involve just the save, can the header rip be done with games that are not supported by the powersave? Like cubic ninja?

 

[LameNobody]

I don't (yet) own a powersaves dongle.
Just one more question: since it seems the trick involve just the save, can the header rip be done with games that are not supported by the powersave? Like cubic ninja?

It can be done with any game, because it involves backing up the save (which you can do to any game) and does not involve any powersaves save editing

Although, cubic ninja gave me an error when i inserted it.... i would erase ninjhax or whatever from it before trying this

 

[4ur0r]

It can be done with any game, because it involves backing up the save (which you can do to any game) and does not involve any powersaves save editing

Although, cubic ninja gave me an error when i inserted it.... i would erase ninjhax or whatever from it before trying this

And thanks again for your great work.

 

[xjoelx]

i have one problem with sky3ds skyempedit tool 've already get my own private header with ths awesome guide by powersave, i foundd out the cart ID with the 16 hex byte (32 in total counting one by one), but the tool required me to put the chip ID too that have 8 lette or numbers in total. So i'm wondering where i can get this chip id

 

[4ur0r]

i have one problem with sky3ds skyempedit tool 've already get my own private header with ths awesome guide by powersave, i foundd out the cart ID with the 16 hex byte (32 in total counting one by one), but the tool required me to put the chip ID too that have 8 lette or numbers in total. So i'm wondering where i can get this chip id

Use che chip-id you find on the basic unmodified sky3ds official template.

 

[xjoelx]

Use che chip-id you find on the basic unmodified sky3ds official template.

ma sei ash 95?

 

[DarkFlare69]

I made a video tutorial:

 

[powersaver]

Thank you!

 

[LameNobody]

I made a video tutorial:

Looks great, I was going to do that originally, but I decided upon GIFs.

 

[Christian Rosado]

Title should be self explanatory of what we're doing here.

Things required:
Powersaves 3DS (obviously)
A game cart
HxD (free hex editing program)

Powersaves steps

Spoiler: Step 1. Navigate to /USERNAME/Powersaves3DS and MOVE all of the .bin files to another folder

Spoiler: Step 2. Open powersaves and create a savegame backup of the cartridge you want the unique ID from.

Spoiler: 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)​

Spoiler: Here's the gif for the hxd steps

Once you have your unique header info you can use it for your backups.
Also, you should probably move your saves bak to the powersaves folder



EDIT-- So, some things I didn't mention....

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 00 00 00 88 Before it, and 48 FF bytes after

Im getting 00 16 00 88 then a 16 bytes line then the 48 FF bytes. is it always?? 00 00 00 88 for all games?

 

[LameNobody]

Im getting 00 16 00 88 then a 16 bytes line then the 48 FF bytes. is it always?? 00 00 00 88 for all games?

I suggest you search for the 16 bytes that you get in your memory, the same pattern with the header should appear at least once more in the memory of powersaves

 

[Zeshix]

Once you have the code, how do you translate it into a .bin file?

 

[LameNobody]

Once you have the code, how do you translate it into a .bin file?

You're the third person to ask me that... Just added a section in the original post about it.

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.

(the chip ID in this .bin header is fake and shouldn't be used, It was removed because i use the generate chip id feature in gateway rom patcher)

 

[Zeshix]

You're the third person to ask me that... Just added a section in the original post about it.

Thanks for the quick answer! The chip id isn't used either way if you patch the template of Sky3ds with the .bin.

 

[LameNobody]

Thanks for the quick answer! The chip id isn't used either way if you patch the template of Sky3ds with the .bin.

(I don't have a sky, so I haven't used any of the tools for it.... so I wouldn't know)

 

[Christian Rosado]

Thanks for the quick answer! The chip id isn't used either way if you patch the template of Sky3ds with the .bin.

So I can just add header and ignore the chip id thats already in that empty bin file?? Its just im getting this error " Error Code: 002-0123

You cannot use online services with this Game Card. So im either using the wrong thing as header or its the chip id. Ive tried over 15 times -_- :/

 

[4ur0r]

So I can just add header and ignore the chip id thats already in that empty bin file?? Its just im getting this error " Error Code: 002-0123

You cannot use online services with this Game Card. So im either using the wrong thing as header or its the chip id. Ive tried over 15 times -_- :/

Most probably, you're getting this error because you're touching the id on your ROM. Just replace the header on your sky3ds template with the header you got with powersaves method.