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AppLounge: Signature of the Calendar app does not match

  • /e/OS version:3.0.2-a15-20250627504414-official-FP6
  • Device model(s): The Fairphone (Gen. 6)
  • Impacted Application: foundation.e.calendar
  • Affected application/URL:
  • Browser/client and version:

The problem

(Beforehand, /e/OS has been manually installed on an Android-FP6.)

App Lounge show an available update for the system app Calendar. But trying to install this update, a error message is displayed:

The update cannot be applied because there is a signature mismatch between the update of Calendar and the version you've installed on your phone. To remedy thes you can uninstall Calendar and then install it again from App Lounge.

But of course it's not possible to uninstall this (system-) app.

See this forum thread for some more information.

Steps to reproduce

  • Open App Lounge and search for updates.
  • Try to update the Calendar app.

Technical details

/e/OS Calendar