Why can't the Android Gregorian calendar be updated?

Update of Gregorian calendar weather software failed, and the possible reasons are as follows:

Mobile phone without network

Problems of solar calendar weather software server

The solar calendar weather is not compatible with the mobile phone system.

This version of the almanac weather software is not compatible with the mobile phone system.

Solutions;

Check whether the phone has a data connection or wifi network.

Wait a while, then refresh the weather.

Change your mobile phone or change the version of almanac weather software.