To install the 2.1.3 software update on the Oscillator Devices Minerva proceed as follows:
 - Copy the file Minerva-2.1.3.hex to the root folder of a SD card. Make sure no other file is on the SD card that starts with "Minerva" and ends with ".hex"
 - Disconnect the power supply
 - Insert the SD card
 - Connect the power supply. The software update starts automatically. The LED will flash orange for approx. one minute. When the software update is finished, the LED will light up green.
 - Disconnect the power supply and remove the software file from the SD card.

How do I check what software version is installed?
 - If you don't already use a configuration file, download it at https://oscillatordevices.com/doc/minerva.cfg
 - Open the configuration file with a text editor and set diagnose_mode=yes
 - Disconnect the power supply, insert the SD card and connect the power supply.
 - Wait until the LED lights up green
 - Disconnect the power supply, remove the SD card.
 - The SD card now contains a file named MINERVA.log. Open it with a text editor. You'll find the current software version on top of the file.
Turn of diagnose mode when finished, because it writes to the SD card. Otherwise it can lead to a corrupted SD card, in case of a sudden power loss.