Once your NAND is installed, ensure your settings are optimized:

: Open Dolphin and go to Tools > Perform Online System Update . Select your preferred region (e.g., US, Europe, Japan). Dolphin will download the necessary system files directly from Nintendo’s servers.

Dump your own NAND from a Wii console you own. This is 100% legal (regardless of DMCA interpretations in some regions, as you are exercising a backup right) and guarantees safety and performance.