Marshmallow Software Update for ZTE Z958
My ZTE Z958 phone, which is currently running Android Lollipop 5.1, has been having issues with several Google applications recently. The only advice I have been given, from several experts, is to update my software. Unfortunately, the "AT&T Software Update" function which is built-in to my settings application, shows the message, "Software is currently up to date." This is frustrating because Android 8.0 has been released, and my device is still three generations behind. Please help me to fix this issue. Thanks in advance!