Hacking [HOW-TO] Use Scene Dumps with GW 2.2 Online

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SAVES FROM .3DS FILE ARE NOT COMPATIBLE WITH .3DZ FILE. MAKE SURE TO MAKE BACKUPS OR THEY MAY BE LOST!

REQUIREMENTS:
A header linked below
OR
A valid gateway dump of a game.
A valid header from said gateway dump. Use info from THIS post from @aliak11 to edit your header to match your rom.


ROM Cleaner found here: http://tinyurl.com/GRPv0-6
Alternative download location: http://filetrip.net/dl?dupiqmdMgr
Scene dump of your game of choice

HOW TO:
Make your ROM dump using GW 2.1/2.2 and copy it to your desktop
Download/extract ROM Cleaner
Modify your header to match your ROM info. Use info from THIS post from @aliak11 to edit your header to match your rom.
Open your ROM Cleaner and click the "export" button, follow the steps to extract the header info from your GW dump
Open your scene dump and click "import", follow the instructions to import the header info to your scene dump.
Change the extension of your newly modified scene dump to .3DZ
Copy to micro-sd
Play online

Spoiler: Technical information about the UniqueID stored in the ROM dump header

The first line is the unique ID of the card, for now don't edit it. You can insert any unique ID into and rom. The second line is the Card ID, this is the one you can change. Below is an explanation of what each hex number means.


1. Manufacturer (0x1240)
45 = SanDisk
AE = OKI Semiconductor
C2 = Macronix


2. Size (0x1241)
7F = 128mb
FF = 256mb
FE = 512mb
FA = 1gb
F8 = 2gb
F0 = 4gb

3. Unknown (0x1242)
00 =
02 =

4. Card Type (0x1243)
90 = card1
98 = card2

LIST OF SHARED HEADERS:
Luigis Mansion (CARD-1, 1GB): https://www.dropbox.com/s/e32pymsp3w2rzok/CTR-P-AGGE.bin
Kirby Triple Deluxe (CARD-1, 1GB): https://dl.dropboxusercontent.com/u/52569571/CTR-P-BALE.bin
Metal Gear Solid 3D (CARD-1 4GB, seems to work with almost all scene dumps): http://ojm5yq2uqr.dl4free.com/

So... to make it simple for all the new arrivals on this thread, the complete method to go online is :
1) Just do a cartridge backup with the Gateway dumper, whatever title OR get a ROM which have be done with a Gateway
2) load this dump with Gateway Rom Patcher v0.6. Check that the cartridge ID of the ROM is present (value different than FFFFFF...). Press Export to save a .bin file.
3) get a ROM you want to play online with. Open it with gateway rom patcher v0.6
4) Press import button and load the .bin you just saved. If the .bin not match your rom, an auto fix will be offered. Accept.
5) Press inject to apply the fixed header to the ROM
6) rename your rom .3ds as .3dz and let's try it online with your gateway !

Bonus step if you did all the steps above and the game still can't connect :
7) reload the ROM into gateway rom patcher, change the Manufacturer ID by another one.
loop to step 5.
Maybe first page should be edited.