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They basically the same except they come with different Actel and SPI firmware versions
D2Pro9v2 has 2.2 HW firmware and 1.5 SPI, it could also have lower versions depending on the reseller
D2Pro9v3 should come with 2.3 HW firmware and 1.6 SPI firmware
I believe the D2Pro9v3 which had some problems now should work on all Wii drive type from D2C to D2E, but you should alsways confirm that with the reseller to make sure.
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