Use a GameCube controller or the console buttons (Power/Reset) to navigate. Select the Gears icon (Options). Select the Green Arrow pointing from the chip to the SD card (Backup). Wait for the process to finish. It will create a 🛠️ What to do if your NAND is already Corrupted
Your console will reject it. The system menu will check the keys, find a mismatch, and refuse to boot. You will have a brick. Even worse, you will have overwritten your own (possibly salvageable) corrupted NAND with a foreign one that will never work. There is no universal "stock Wii NAND" because the keys are the console’s identity. Wii Nand Backup Files Download
Every Wii has unique (stored in the SEEPROM and OTP chips). A NAND backup from "Console A" will not work on "Console B" because the data is encrypted specifically for Console A's hardware. Use a GameCube controller or the console buttons
The NAND memory on the Wii console stores critical data, including: Wait for the process to finish
Every Wii has unique encryption keys; a NAND backup from another Wii will not work on yours without advanced, risky modification.