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EV2300 and BQ40Z60 connection problem

Other Parts Discussed in Thread: BQ40Z60, BQSTUDIO

Hello,

I was using EV2300 and BQ40Z60 everything was working fine. But now i have a problem if i press some of the commands on the right side(BQstudio) i always get "Comand error sending data: Not able to find a free comunication adapter." maybe its the driver i searched on google and a lot of people have the same issue, i installed USB Drivers for Windows XP and Windows 7 (Rev. A)  from the official page, i also tried to install Windows XP SP2 and SP3, Windows 7 x64 with this drive r EV2300a_Device_Driver_Installer_Multilanguage. The installation process always succeed, but its not working its like that there is no connection between my laptop and ev2300.I tried on serval laptops but nothing seems to work.

Can someone Help me!!

Thank you