@Kelvin1678 Yes, you can still use the M5 with BE550 but I would suggest to set M5 in AP mode to avoid the double NAT in your network.

@AX55FixFix There's two options that could cause this issue. 1. Bad ethernet cable (more often) - change the cable with another one of a good quality. 2. Bad Internet connection port recepticle (less...

@bogdanws Here's the guide for registering or modifying a TP-Link DDNS. If after all you can bind this TP-Link DDNS just regiter a new one.

@Mossycheong If this issue has been observed only with this device then probably you should look into its network adapter settings/properties, outdated drivers, etc. If afer all, you can't pinpoint...

@ZubaerAhmad-XI TBH, I didn't know what the signal strength was before FW update to compare it now, but I didn't notice any problems in my particular setup with the wireless coverage..

@Mar-tin Any home grade UPS could support your MR600. Power supply for MR600 is with output parameter 12VDC/1.5A, so it needs 18W of power.