To re-create your own .3ds / .3dz you can simply:
1. Generate your xorpads
2. Decrypt the .3ds (Important exefs.bin / exheader.bin / romfs)
3. Decrypt/Extract romfs
4. Insert the latest translation files and overwrite the originals
5. Start 3DS Builder and enter details like in the picture and press go
6. After your new .3ds file is generated, start Gateway ROM Patcher
7. Important, set the right chip id and use always the same cart id
Done, now it will work with Gateway as .3dz!
If it hungs on loading screen, consider to gw3ds fix both (micro)SD cards.
1. Generate your xorpads
2. Decrypt the .3ds (Important exefs.bin / exheader.bin / romfs)
3. Decrypt/Extract romfs
4. Insert the latest translation files and overwrite the originals
5. Start 3DS Builder and enter details like in the picture and press go
6. After your new .3ds file is generated, start Gateway ROM Patcher
7. Important, set the right chip id and use always the same cart id
Done, now it will work with Gateway as .3dz!
If it hungs on loading screen, consider to gw3ds fix both (micro)SD cards.