Downloading a backup from a different revision will almost certainly brick your console. There is no "universal" Wii NAND.
: If you use a shared NAND to play online via services like Wiimmfi, any rules broken by one person using that NAND will result in a ban for everyone sharing those files. Wii Nand Backup Files Download
Procedure * Insert the SD card into your Wii. * For IOS Users: Open the Homebrew Channel. Press the HOME button on the Wii Remote, ConsoleMods Wiki Downloading a backup from a different revision will
Hold Reset on power-on → Priiloader menu → Fix system menu or load homebrew. Procedure * Insert the SD card into your Wii
: Since Wiimotes often don't work in this menu, use the buttons on the front of the Wii console: Power : Moves the cursor. Reset : Selects an option. Start the Backup : Select the Options icon (the gears).
A NAND backup serves as a "save state" for your entire system memory, allowing you to restore the Wii to its original state if it ever encounters a system-breaking "brick". Why You Can't Simply Download a NAND File