@SEAL Make sure that the 2.4 GHz network is enabled and Hide SSID is not enabled: If the issue persists reset to factory defaults - method 1 and re-configure the router from scratch. If the issue...

@Spocki990 Since you already have a Zyxel main router you should configure the C80 or the Deco in AP mode to avoid the double NAT in your network. Here's (case 1) how to do that for Archer C80....

@D.R.B I presume you're with the EU region FW version - you can determine that from the bottom sticker. Here you can find the latest FW release for your device.

@MIOT It seems that this would be the case - VR600 v2 supports Printer Sharing, while VR600 v3 doesn't - you can see that by the devices' user guide.

@JimPerry That depends on your hardware but in general when power is restored the security camera should re-connect automatically to your router and Internet.

@dbarton3 It doesn't seem that AX21 support a print server - according to its user guide - Chapter 7.