@Chrisparf @David-TP Exact this happens also in my situation, but with the latest official firmware, via chrome or edge browser.

@David-TP Hi David, Your theory seems to be correct. I've logged on the main deco, it is early in the morning. So not much activity on the wifi. And the page seems correct. Enable IGMP is there...

the system parameter page is not ok.. Some parameters are missing.. Some are there, which shouldn't be there. IGMP is missing WAN unicast is greyed out Wifi coverage is new And when you browse to the...

@David-TP Same issues here with same firmware version.. Also the option enable IGMP disappeared..

@Chrisparf Same issues here with the same firmware version.. Also the option enable IGMP is not available anymore.. When you browse to the system parameter page, the error message "operation failed"...