The most common way to get this file is through , a piece of homebrew software used for system brick protection:
Power on your Wii. If BootMii is installed as boot2, it will launch automatically. If installed as IOS, launch it via the Homebrew Channel by pressing the Home button and selecting "Launch BootMii." keys.bin wii
: Copy both files to a safe location, such as cloud storage or a dedicated "Wii Backup" folder on your PC. These are unique to your console; you cannot use keys from another Wii to fix yours. What can you do with keys.bin ? BootMii Backup | Wii Hacks Guide The most common way to get this file
The IOS (operating system) uses these keys to verify signatures and decrypt files. keys.bin wii