Hi,

I bought a GM328 transistor tester that can't be calibrated. It stucks 
at the "short probes" stage. Anyway, I decided to update the MCU 
firmware.

I connected the ATMega328pu to my breadboard and I double checked the 
connections with my DMM. The AVRdude always return the following error :

1

D:\temp\GM328\EN>avrdude -pm328p -cUSBasp -B4 -Pusb

2

3

avrdude: set SCK frequency to 187500 Hz

4

avrdude: warning: cannot set sck period. please check for usbasp firmware update.

5

avrdude: error: programm enable: target doesn't answer. 1

6

avrdude: initialization failed, rc=-1

7

         Double check connections and try again, or use -F to override

8

         this check.

9

10

11

avrdude done.  Thank you.

I even tried to connect an external crystal but without luck. What seems 
to be wrong here? My OS is Win10/64Bit and AVRdude is v5.10

Regards,