Users have often complained that it’s frustrating to install USBasp driver for Windows 7 64-bit and Windows 8.1.Unfortunatley I am having some problems with a USBasp programmer I got recently. I will be updating the driver installation instructions for OpenSprinkler 2.1 and SquareWear right away, as they both use USBasp bootloader. That’s it! Because the drivers are digitally signed, there is no hassle installing it in Windows 7 64-bit and Windows 8.1.

Then in the selection box (see below), choose libusb-win32 (v1.2.6.0), and click on Install Driver, and wait for the installation to complete.

At this point, run Zadig, it should detect the USBasp or USBtiny, or any libusb device that you have.

If a window pops up asking to search for driver, just close it or click on Cancel. In case your microcontroller uses a USBasp or USBtiny bootloader, enter bootloading mode, and let Windows detect the device (it will report driver not found).

Plug in your USBasp or USBtiny device.

Go to and download the software (note that Windows XP has a separate link).

I was mostly surprised such a great solution wasn’t documented more widely online. Since USBasp and USBtiny are both based on libusb, could it be the right solution? To my great surprise it worked really well - I was able to install both drivers on Windows XP, 7 (32-bit and 64-bit), 8, and 8.1 instantly, without messing with driver signature enforcement at all. A huge source of frustration.Īnyways, while searching for ‘fully signed USBasp driver’, I came across this tool called Zadig, which can be used to install libusb drivers on all versions of Windows, and it’s digitally signed. Even after you’ve done it once, if you boot into the normal mode next time, it may fail to recognize the driver again (reporting it’s not digitally signed).

The typical solution involves rebooting Windows into a mode that disables driver signature enforcement. Today I came across a surprisingly simple approach to installing USBasp and USBtiny drivers for all versions of Windows - XP, 7, 8, 8.1, whether 32-bit or 64-bit, all inclusive! As you may know, installing open-source drivers such as USBasp and USBtiny have been a great pain on some of the recent Windows OS, due to the enforcement of signed drivers.

Zadig for windows 10