I'm trying to use the avrispmkII to burn the bootloader or upload a sketch but it doesn't do it
the only thing I get is
avrdude: stk500v2_recv_mk2: error in USB receive
avrdude: stk500v2_recv_mk2: error in USB receive
avrdude: stk500v2_recv_mk2: error in USB receive
avrdude: stk500v2_recv_mk2: error in USB receive
When you program, is the Uno/Nano powered? The MKii does not provide power, it only monitors it.
Also, is it plugged on correctly? The Red wire goes on the Pin 1 end.
Yes, both are powered by external power (12V 2A for my UNO) and of course I know how to connect it properly just like I connect USBasp to burn the bootloader (wchich works properly).