FlashScan/AutoCal V3 devices appear as a Windows USB drive in Windows Explorer.  There are no external drivers to install.  There are a number of potential reasons why FlashScan/AutoCal V3 will not connect via USB.

1. Ensure you are using the heavy gauge EFILive USB cable that shipping with your device.
2. Ensure you have downloaded and installed the latest version of EFILive's V8 software, available here.
3. Rapid connection/disconnection of FlashScan/AutoCal V3's USB cable may cause FlashScan/AutoCal V3 to fail to power up via USB connection.  If the device does not power up within 10 seconds of a USB connection, you can reset FlashScan/AutoCal V3 by powering up via the OBDII connection.
4. With FlashScan/AutoCal V3 connected to your PC, open V8 Scan and Tune software and select the [Check Firmware] option.  Install any pending updates.
5. On FlashScan/AutoCal V3 navigate to Options -> F1: Setup -> F3: Update Boot Block and install any pending boot block updates.
6. For computers running Windows 10, users should install the latest Windows 10 drivers.  Please refer to the Windows 10 Drivers for FlashScan/AutoCal V3 knowledgebase article.
7. For some computers running Windows 7 it may be necessary to install WINUSB drivers.  Please refer to the WINUSB Drivers for FlashScan/AutoCal V3 on Windows 7 knowledgebase article.