Hi there, welcome to the Community, and thanks for reaching out. I can certainly understand the frustration of not getting software updates on your phone. Software updates are like oil changes and tune-ups for your phone or tablets - they keep things running smoothly. They also help improve the user interface, enhance security, and remove minor bugs. We recommend updating the software whenever a new version is available so you can make sure your device stays in tip-top shape. Use this guide for the myriad of ways to update your device: https://www.samsung.com/us/support/answer/ANS00077582/
If this still doesn't get your device updated, it would be best to contact your carrier, since they are the ones who roll updates out to the users' end.
Can you elaborate on what you mean by the "merge and swap" you are wanting back on your phone? More details will help us assist!