Geeetech

I have the same problem, it looks as if the platform get accelerated the pin drops, it occasionally pulls up again, but at that stage ruins the print sometimes after hours of printing !!

I am new user and have not yet upgrade nor upload new firmware. I thus want to save the current configuration if something goes wrong. I install ArduinoAvr and got avrdude running.

However if I run
avrdude -pm2560 -n -v -c stk500v2 -Pcom7 -U flash:r:flash.bin:r''

it only says timeout. I did check ...