Hi,
the CCCCC mean that the FIS-Control is software-loading mode and is waiting for a new firmware file.
You can download the latest firmware here (see the Download section on the right):
https://fis-control.de/index_en.html
Now use the Android app: Click "Upload file to FIS-Control" and pick the downloaded firmware file.
After about 3 minutes the update should be complete and you can cycle the ignition to restart the FIS-Control.