VoCore Forum

What are you programming with the AVR USB programmer? If you connect to it through usb, it uses avr-libc and it has an spi port the serprog protocol may work.

From GNUtoo's documentation:
Only the AVR architecture is supported for now, because the code depends on avr-libc. In one hand that makes it portable across other non-arduino AVR boards...

I bought it to burn arduino bootloader, but never used it yet

To what kind of Arduino? Or were you going use with a plain AVR chip?