Save Editing Tutorial | Mario Odyssey | Requires Homebrew

Download nut-v0.1.zip from https://github.com/3096/nut/releases/.

Make a new folder on your SD card inside the switch folder, name it nut, then put the contents of the ZIP inside.

Put your SD back your console. Boot into CFW and go to the Homebrew Launcher.

Extract your save from your console with the newly appearing Y'All Are NUTs.

Turn off your console now, and put the SD into your PC.

After you run the homebrew app and dump your save, it will be in the save or dump folder inside the nut folder inside the switch folder.

Copy the folder to somewheres safe, back it all up, and then copy it to a directory you can modify it in.

Get HxD Hex Editor from here: https://mh-nexus.de/en/hxd/

Open your File#.bin inside HxD. (Remember, # is the save number)

Copy everything past the first 16 bytes (First Line) into a new file.

Save it as a File#.byml (for #, use the same save number)

Get https://github.com/exelix11/TheFourthDimension/releases and extract it to somewheres you can open it.

Ignore the startup message about files if it appears.

Use Byml > Xml in the File tab to convert the .byml to .xml.

Open the xml up in your favorite text editor. I recommend Notepad++.

Change whatever aspect of your save you'd like. I'd start simple with coins or moons.

Save the XML.

Open back up Fourth Dimension if you closed it, and use Xml > Byml in the File tab.

Close HxD entirely. Re-open it and open the File#.bin and the new .byml file in it.

In the .bin, delete all bytes after the first 16 bytes, or the first line.

In the .byml, do CTRL + A, then copy. Go to the .bin, select the end of the file, then right click and hit Paste Insert.

Do CTRL + A, and keep track of the Length: ######.

Go to the end of the File, and click right after the last byte. In the Edit tab, click Insert Bytes.

Open a calculator that supports HEX, I use Windows 7's Programmers Calculator in the Calculator application.

Now, do 20000C - the length from HxD.

In HxD, go back to Insert Bytes and insert the amount you just got from your Calculator.

Save and Quit.

On your SD, in the nut folder, inside inject, go ahead and put your new File#.bin in there.

After you put the SD back in the switch, you can go back to Y'All Are NUTs, find your user, and hit Inject now.
After it says Changes committed, reboot.

There you go! You can now launch Super Mario Odyssey and your save should now be modified.