Firmware 4.0 is much quicker at focusing, but the Techart Pro adapter makes more noise than ever while focusing. From my initial testing FW4 seems like a pretty substantial improvement in focusing performance.
Techart PRO Firmware v4.0
1. Improve the focusing speed and accuracy
2. Improve the stability of the adapter
You can find the instructions at
http://techartpro.com/downloads-2/
