I use ispvm system to program cpld lc4064, but every time I click Scan at the beginning, the error "Failed to scan board" is reported. What's the reason?

Ispvm system download program abnormality is mostly caused by driver problems. If the computer is Win10 or Win8, you need to go to Settings\Update and Security\Recovery\Advanced Startup\Troubleshooting\Advanced Options\Startup Settings during installation; then Restart and choose to disable driver auto-signing to install the driver correctly.

In addition, some download cables under Win10 require the USB cable to be unplugged and plugged in every step of the operation.

For example, press Scan and search for LC4064 to select the operation to be performed, then unplug and plug the USB cable and click GO to write or erase a chip. You will also need to unplug and plug again when operating the next chip.

The ispvm system must be run as an administrator when starting.

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