@GreyMouse65 When we reset/configure the WiFi router, it sets 2.4 GHz on 20MHz channel width by default. Several old equipments do not recognise 40MHz. I'm just suggesting you to check your WiFi...

@GreyMouse65 This usually happens when the channel width of the 2.4/5 GHz is not recognized by your devices. Use 20Hz channel width for 2.4 GHz band.

@Alexandre. Yes. that's what I tried. I wish tp-link will add an option to set separate SSID for 2.4 & 5 GHz soon.

@Alexandre. Thank you. I tried this already. Keeping the guest network open all the time may be risky. The same was highlighted by the tp-link app's security scan. I wouldn't prefer taking any risk.

It's really sad to see that there's no option to set up SSID for 2.4 & 5 GHz seperately on DECO XE75 mesh router. Also, there's no option to choose a specific deco mesh unit for a phone/tablet. These...

@David-TP I'm returning my deco xe75 mesh system for the same reason. They should have provided an option to set up 2.4 & 5 GHz bands separately. I have been using AX10 wifi 6 router which has this...