There are no such restrictions. Theoretically, you can sync hundreds of calendars, so I guess there’s another reason why some calendars don’t show up. Do those calendars have something in common, for instance are they shared calendars?
i try to revive my Asus TF101 with a custom rom. Unfortunately DAVX5 does not work. If I try to add an account the app “stops working” but closes only the account creation window. The app itself remains open. Any ideas?
This sounds like a problem of your custom ROM. You can however use adb to get more information: https://www.davx5.com/faq/how-to-debug#c77
adb logcat say when you try to add an account?
Seems like it crashes when conscrypt (a library for TLS protocols and ciphers) is loaded. You would have to ask your Custom ROM vendor about that.
@rfc2822 Well… this ROM is very old… I think there will be nobody I can ask…
I see. Then you could also try to compile DAVx5 without Conscrypt (you’d only have to comment out a few lines in cert4android).