Or could you give us a hint about what’s wrong with our OC version?
As you can see from the debug logs, your server responds with 500 Internal Server Error
to a REPORT addressbook-query
request.
I, too, would rather downgrade to an earlier DAVdroid version (which worked great) than upgrade ownCloud which I haven’t done yet for a couple of reasons…
You’re of course free to use any DAVdroid version you want 
Would you happen to have any other suggestions?
DAVdroid has an ugly fallback-hack that falls back to PROPFIND
when a server responds with some defined HTTP error codes (like 400 Bad Request and 403 Forbidden) to REPORT addressbook-query
. This ugly fallback-hack will now be activated for the following status codes (on REPORT addressbook-query

- 400 Bad Request – this is what a server sends when it thinks the
REPORT
is invalid
- 403 Forbidden – some servers refuse the empty
<filter/>
and say that it’s not a supported filter type, so the correct response code for that is 403
- 500 Internal Server Error – some servers (like yours) just don’t know what to do and return an “all-catch” error
- 501 Not Implemented – that would be the right error code for a server that knows it MUST support
REPORT addressbook-query
, but it’s not implemented nevertheless.
So, with this ugly fallback-hack in the next DAVdroid release, you will (hopefully) be able to sync again with your OwnCloud 7 installations – but that doesn’t change anything about the fact that they’re defect.