Wii mod chip?
Well, i have a wii key, and i am planing to mod it. I know how, but its firmware is 3.1US. Can i still mod it?
Yes, the wiikey is not a clone.
Check which chipset your Wii has.
Nintendo-Scene Wii Serial Tracker
WiiKey will work with D2A,D2B chipsets. It won't work with D2C chipsets.
If you have a D2C chipset, the only modchip out there for it (right now) is the D2CKey. It'll run you about $50 and if you aren't good at soldering I don't suggest you do it yourself, you can screw up easily.