Taking the Beelink SER5 PRO 5600H apart is a very easy process. To start with, you will need to remove the four screws located at each corner on the bottom. With that done, the bottom plate can be lifted up and over. Do not pull too far or too hard, as there is a SATA ribbon cable attached to the bottom plate, as it also serves as a 2.5-inch HDD tray. At this point, you now have access to both system memory and storage.
While going beyond this likely isn't needed for any future upgrades, if you want to give the system a deep clean, you can do so by removing the memory and SSD for a clearer look. At this point, we can see Beelink is using a MediaTek RZ608 Wi-Fi module which is Wi-Fi 6E 2x2 rated, offering Bluetooth 5.2 support. Fun fact, this particular module was made via a partnership with MediaTek and AMD. That said, to remove the motherboard, you will need to remove four screws located in each corner. Once those screws are taken out, the motherboard can be removed, but be careful as the Wi-Fi antenna cables are rather short. Even so, enough slack is present that you can separate everything, as shown here.
With everything carefully separated, you can now flip the board over to gain access to the CPU cooler and fan, along with the CMOS battery.
Finally, a closer look at the memory and SSD reveals that Beelink opted to use a Kingston NV1 PCIe 3.0 NVMe SSD and 2x 16 GB of Crucial DDR4 3200 MHz SODIMM memory modules.