This step only needed because no custom firmware is available yet.

Insert the SD card in your printer with the Bear Hemera

In the menu of your printer select "Print from SD" and choose the file bear_hemera_config_mk*.gcode.

The printer might say it is an incomplete file but it is a wrong message, click to continue and print this file.

You can now delete the bear_hemera_config_mk*.gcode file from the SD card because it will not be used anymore.