Davdroid 1.6.2 incompatible with Android 4.0
Latest version of Davdroid available for Android 4.0.4 in F-droid app is 1.6.2. Unfortunately, this version requires Android 4.1, but this was missing from the changelog. When trying to downgrading to older versions F-droid client gives an "unexpected end of steam" error. This leaves any user on Adroid 4.0 with non-working version of davdroid after upgrade.
For reference, a link to davdroid forum where issue is discussed. https://forums.bitfire.at/topic/1497/davdroid-1-6-1-1-ose-compatibility-issue