Model :

Hardware Version :

Firmware Version :

ISP :

Hello,

So here's the problem: every time I try to set a bandwitch for guests network, I get this error:




Here is what I've been trying to do:



And here is my internet parameters:

Firmware Version: 0.8.0 1.1 v0046.0 Build 151229 Rel.56978n
Hardware Version: Archer D50 v1


Am I missing something?

Thanks for any advance!