From the site
So D2Pro9v2 for D2C and D2pro9v3 for D2EThis is the latest d2pro9 chip combined with the latest genuine v4c-3 wiiclip. We recommend this version for D2E chipset wiis only. If you have a d2c/d2c2 the V2 will work better.
This has the newest firmware with bugs fixed, only a few distributors have this revision of the V3 D2PRO9 .
Check the tutorial section for installing tutorial.