Autofocuser firmware upgrade

Firmware upgrade is a simple yet delicate procedure. That is way I have put together simple and straightforward step-by-step instructions for installing the latest version of our ASCOM budget autofocuser firmware. We will probably release updated versions quite often in next few months, but that should decrease as more and more units are out and tested by our customers.


Please follow upgrade instructions very carefully. Deviating from the instructions could cause bootloader issues or in worse case unresponsive focuser unit, for which we are not responsible.

Step 1

Connect the autofocuser unit directly to computer (do not use USB hub). In device manager check which COM port was assigned to it and write it down. If autofocuser is not recognized, check FAQ for details.

Step 2

Download the latest firmware.

Step 4

Start Deep SKy Dad FirmwareUpgrade as administrator and enter following settings:
  • COM port - choose COM port that you have written down
  • Hex file - choose previously downloaded firmware

Step 5

Click "Upload" and wait, it can take a minute. After it is finished, you should get "Upload successful!" message under Status. If you get "Upload failed - click on Output for details", please click Output button in the upper right corner and send us the contents of the opened dialog window. IMPORTANT: in case uploading is stuck at "Uploading..." check the arduino leds - if they are blinking rapidly, do not unplug the arduino. Unplug it only if there is no rapid blinking.

Step 6

After successful upgrade, you also need to install the latest ASCOM driver.