@David-TP i switched deco x50 as main deco and there is no option for hybrid mesh back up and also there is no option for 3G/4G back up. There is only back up option is hotspot

@David-TP thank you for reply My deco x50 is EU ver:1.0 Firmware: 1.6.7 build 25031412 Rel.48241

I bought a Deco x50-4g to add my deco network for 4g internet back up.After setting x50-4g as main router for decos on the phone app iot network settings,mesh setting and restart schedule settings...