Had to reinstall Windows 10 and Atmel Studio 7. Now both my programmers AVRISP mkII and JTAGICE mkII don't show in Atmel Studio. They just appear in Device Manager with an exclamation mark and the following error message: 'Windows cannot verify the digital signature for the drivers required for this device. A recent hardware or software change might have installed a file that is signed incorrectly or damaged, or that might be malicious software from an unknown source. (Code 52)' Anyone know how to fix this problem? I ran into a similar issue for my JTAGICE mkII. One workaround that I came across is the following: ATMEL JTAGICEmkII - Windows 10 Driver setup Workaround: Use Zadig from or libusb-win32 from to change the driver to libusb0.

1. Atmel Avrisp Mkii Programmer
2. Avrisp Mkii Driver Download

Then the tool should appear in Atmel Studio as normal. At this point you have installed ATMEL Studio and your USB Controller Driver appears in the Windows Devices list. (If there is a Driver conflict as shown below, reinstall the driver to correct this. Right click on the driver and select 'Uninstall' then reboot.) Once the Driver is correctly installed, perform the steps shown below. Open the Zadig program you just downloaded. Select OPTIONS List All Devices.

Then Select your Controller as shown. Select libusb-win32 as the driver to be converted. Then simply select the “INSTALL DRIVER” Button. The USB controller will now be visible in AVR Studio 7. Hopefully this will work for you.

I successfully managed to flash the libUSB-AVRISP-MKII.hex firmware onto the programmer using but Flip and dfuprogrammer on os x. I made a 10 pin to 6 pin ICSP adapter that I've checked over but I've been unable to program my atmega644 on my mac. Below is the output when I try to burn the fuses. I've tried the macports version of AVRDUDE as well as Crosspack and have had no luck. Is there a known issue with libusb that would require a custom build or something of libusb/avrdude?

Atmel Avrisp Mkii Programmer

Avrisp Mkii Driver Download

Hey, There is a software bug that affects LUFA-based programmers in newest releases of AVRDUDE. Either use AVRDUDE versions prior to 6.x.x or apply to the AVRDUDE sources and compile. If you want to apply the patch refer to this post by HypervisorX: The same problems appears in newest releases of Arduino IDE – they use AVRDUDE versions 6.0.1 or newer. The last suitable Arduino IDE version that uses pre-6.x.x AVRDUDE version is Arduino IDE 1.5.7. The official bug report is here: More about the issue can be found here: Best regards, Lub/OLIMEX P.S. I know it is an old post, just stumbled upon it and in case somebody else stumbles upon it I want the situation to be clear.