I am flashing a KK2.1.5 using a USBasp. I installed the drivers for the USBasp from fischl.de. but when I try to flash the KK, I get this. But I check and the driver is installed (I am on Windows 10), here are screenshots of my device manager. I search online and the only person I found with this problem had gotten the wiring wrong on his USBasp adapter cable. Mine came with a factory adapter, of with I did compare it to your adapter plans above and it seems alright. Any help would be great, I need to get this thing in the air!