Error 505 after Android 6 update

[Ch4o5]

I'm not able to install several apps (for example spotify) after my update to Android 6. Play store links at error code 505. Apps aren't displayed in settings. Tried to delete data from store, framework and services and nothing worked so far. Looks like failure due to permissions.
Any ideas? Don't want to reset my device.

[Qatrium]

@Ch4o5

I think you'll need to reset your phone. I've read some report online from other manufacturers. Looks like a compatibility issue when upgrading over your old system. My advice is to backup your data then perform a software repair using PC Companion.

[Ch4o5]

Okay, thanks Quester! So I have to try this unfortunately