The minimum OS required for compatibility:
- iOS: iOS 12+
- Android OS: 6.0+
- Amazon OS: 6.0+

For iOS devices:
1. To update your iOS version, navigate to 'Settings' > 'General' < 'System Update.'
2. Your device should now begin the iOS update process.

For Android devices:
1. You can update your OS version by navigating to your device's 'Settings' > 'System' > 'System Update.'
2. Your device should now begin the OS update.

For Amazon devices:
1. You can update your OS version by swiping down from the top of the tablet.
2. Tap 'Settings' > 'Device Options,' then tap 'Update.'
3. Your device should now begin the OS update process.