If you have an old Samsung tablet that's not receiving automatic software updates, you can try to force an update manually by following these steps:
1. Connect your tablet to a steady Wi-Fi network - Wait for the tablet to finish connecting to the Wi-Fi network.
2. Go to Settings - This can be found in the App Drawer or in the quick settings menu.
3. Tap on System Updates – Look for Update from the drop-down menu and tap it.
4. Check for updates – Click on Check now or similar options provided.
5. Download and Install – When an update is found, click download and wait for it to complete. Once it is downloaded, click on the Install button and wait for the update to install.
If a new update is available, this method should prompt it to show as an option for your device. However, if your device is too old and is no longer supported by the manufacturer, then it is unlikely that new software updates will be available for that device.