Please burn a new Max2Play image onto the SD card. You can download the latest versions of Max2Play here: https://www.max2play.com/en/max2play-image/
If you don’t really need the latest kernels, I would recommend not updating manually. We regularly release new Max2Play images with the latest kernels, which we have tested extensively beforehand. With a manual installation, we cannot guarantee that the system will still function properly afterwards.