This weekend my HomeMatic CCU2 told me, that there is a firmware upgrade for my heating thermostats available. Hence I had some tiny problems during the upgrade process, I decided to write this short how-to.
If you have problems to get rid of FHEM, because of some package inconsistencies cause by broken installation or so, you can do this:
$> sudo dpkg --remove --force-remove-reinstreq fhem
$> sudo apt-get-update -f