Well, I guess this won’t be helpful to you, but my R7 got OTA-updates until Version 4.0.1.48 (always updated via GUI without any problems). Then there where no more OTA updates available for it.
User msdk brought his device further by updating via terminal (see this thread), but the latest update to 4.5.0.19 resulted in troubles with camera and gps.
What’s really annoying, is that there’s no reaction of Jolla (or other “knowing people”) on this at all…