Rebooting, blackscreen while phoning, no update possible

[Johannes]

@Tristan

First, I can’t update the Fairphone OS. At the moment I’m using OS 17.04.8.

Did you already update Fairphone updater via Google play / yalp? Is the Google app enabled? See also:

FP2 Update Problems - troubleshooting

This is a troubleshooting guide for updating the FP2. For the FP1(U) check this guide. Even though the updates are tested before they’re released, sometimes they don’t install smoothly on some of the phones. If you’re unlucky enough to experience issues, then there’s quite some information on how to get going again; both official information on the Fairphone Support pages and unofficial tips and tricks by other users on the forum. This wiki aims to provide an overview. If …

@Tristan

Second, my Fairphone 2 is rebooting quite often, sometimes more than once daily.

See rebootsguide

@Tristan

Third, if I’m calling someone, the Fairphone stays in black-screen-mode.

There’s a tool to configure the proximity sensor properly. See the Fairphone troubleshooter (Display > Stays black during or after the call) or the blackscreenguide