[HansR]

I had some trouble to remember how to do the firmware update so I made a small howto for those who tend to forget things and don't work often with Arduino IDE. The instructions below should save you some time and are similar to what I published on the CumulusMX forum (in the Alpha thread).

--------------

If you still have the Arduino IDE (1.8.19) config it is easy: just download the new firmware from the site (look at the date), unzip into the Arduino directory and compile and upload to the board.

If you don't have the config:

1. Install the IDE 1.8.19
   
2. Install the ESP32 board:
   • In your Arduino IDE, go to File> Preferences.
     
   • Open the Boards Manager. Go to Tools > Board > Boards Manager…
     
   • Search for ESP32 and press install button for the “ESP32 by Espressif Systems“
     
   • Install version 2.0.3
     
3. Move the WeatherDuino_AQM_III directory from the zip to the Arduino directory. It contains a libraries, software and utilities directory
   
4. Move the libraries directory from the firmware zip up to the Arduino directory first level
   
5. Edit the Config_Options.h and Credentials.h to what you need
   
6. Verify and when no errors => Upload
   

I think that should be it.
Don't even try other versions of the IDE and Board unless you want to experiment.
If werk_ag decides to move to a next IDE version no doubt he will indicate which versions you need and publish the libraries accordingly.