Currently, when you try to connect to Wiimmfi with a game other than Mario Kart Wii with a friend code that was assigned by the original Nintendo servers, you will probably get error code 60000.

Error code 60000 means the server doesn't know what your friend code is, and the game refuses to accept the newly assigned friend code by Wiimmfi as it knows that it already has a different friend code.
For Mario Kart Wii, we've fixed that with the patcher update in 2018, so for Mario Kart Wii the error 60000 is already long gone.

Not so much for other games, the only easy solution until now was to delete your savegame to get a new friend code. I'm hoping to be able to change that with this beta test.

While the fix for error 60000 which we developed for Mario Kart Wii could manually be adapted for other games, that would be lots of work. It would require porting that patch to a bunch of different games and regions. What I tried is to make a small program that reads the main.dol file of a Wii game, and can then auto-generate a gecko cheat code for this particular game, containing the error 60000 fix.

I have run that program over a couple games I had laying around, and it was able to create patch cheat codes for all of them. I haven't been able to test them much, as I don't have any savegames that still result in error 60000, so this isn't really tested much.

If you want to test this, you need A) a copy of your savegame, just in case something goes wrong and the patch breaks or corrupts your savegame, and B) the DOL file of your game which you can extract from an ISO or WBFS file using WIT ( wit.wiimm.de/ )

Instructions:

1. Make a backup of your savegame using tools like Savegame Manager GX
   
2. If you haven't done that already, make a dump of your game disc using tools like Cleanrip and copy it to your computer
   
3. Install WIT ( wit.wiimm.de ) if not already installed, then extract the game using wit extract game.iso folder, replacing "game.iso" with the file name of your game image.
   
4. Copy the main.dol file from folder/sys to a folder where you'll find it again.
   
5. Download the tool from the attachment of this post and extract that to the same folder.
   
6. Open a command line in the folder where the tool and the DOL file is, and execute the program with the file name as first and only parameter.
   If you are using Windows, that'll most likely be 60000-cheatcode-generator-win64.exe main.dol
   
7. If the tool outputs "Can't find X" and an error message, it looks like the tool doesn't work with your game (yet). Let me know what game you tried and I'll try adding support for that game.
   
8. If the tool does support your game, it'll output something like "Found GetUserID v1, loginStatePtr v1, InvalidGSID v1" (maybe with other version numbers) and a cheat code
   
9. You can now start the game with that cheat code applied (using tools like GeckoOS or a USB-Loader, like you would use any other cheat code)
   
10. While the cheat code is enabled, the game should now blindly accept the friend code sent by the server and should no longer complain with error 60000. After you've connected to Wiimmfi once and successfully received a new friend code, you can remove the cheat code again - the patch is only needed once.
    

Confirmed working in the following games:

• Mario Kart Wii (code not needed, already implemented in the Wiimmfi update) [v1, v1, v1]
  
• Animal Crossing Wii
  
• Deca Sports 2
  
• Naruto Shippuden Clash of Ninja Revolution 3
  
• Naruto Genkitou: Ninja Taisen Special
  
• Pokemon Battle Revolution
  
• Rayman Raving Rabbids 2
  
• Super Smash Bros Brawl
  
• The Last Story
  

Confirmed non-working in the following games:

• -
  

If you've tested the patch with a game not on these lists yet, please post here, tell what game it is, what the tool displayed (especially the three version numbers) and if the patch worked or not. That way I can add the game to the compatibility list above, or try to fix the tool if it doesn't work with your game.

Would you mind testing this version and see if that works better?

EDIT: Test version removed, use the one from the 1st post.

Yeah, the tool is a command line tool, it's supposed to be run from the command line, not by drag and drop. I'll try to make that work as well later.
I've sent you the two updated cheat codes in your private message, just see if these cheatcodes work.

After I've been asked, here's the source code of this generator tool: github.com/Leseratte10/60000-cheatcode-generator

Are you in the correct folder? You usually need to use cd to change to the folder your file is in so the command line knows where the file is.

Easiest is probably using a tool like USB Loader GX which can apply Gecko codes and a Wiimmfi patch at the same time.

This tool doesn't patch the main.dol. It only uses information from the main.dol to generate the cheat code that it displayed. There's no need to convert that DOL back into an image.

You did get one wbfs and one wbf1 file because SSBB is larger than 4GB and some file systems (like FAT32) only support files up to 4GB so it was split into two.

You would need to start the original (Wiimmfi-patched) SSBB copy with a USB loader or any other application that allows you to load a Wiimmfi patch and a cheat at the same time. Using WiiFlow should normally work, though. Do you have cIOSes installed on the Wii? These are required to load games from USB or SD.