I'm receiving notifications from my banking apps that they will no longer support my older operating system Android 4.1.2.
If the tablet is currently running Android 4.1.2, that is likely the most recent version of the OS for that device and won't be receiving any more updates. You can either replace it with a newer device or use your banking app on a newer smartphone.
Ann154 is correct. The device's latest available OS is Jelly Bean, 4.1. If an application requires an OS later than this, the application would not function correctly with your device.
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