@merta I'm afraid not, V1.20 and V1.0 are different pieces of hardware, so you will not be allowed to upgrade to the firmware for the v1.20.

@dron601 Can I have a screenshot of the DSL status page?

@Bagus1308 When they lose the internet access, are they still connected to the network? Is there still an IP address on the devices? Try to ping the gateway of the WR940N when there is a valid IP...

@John-boy Hi John, sorry that I missed this post. Actually we can follow this up on the other post, and I have given you some suggestions, please give it a go and confirm, thanks a lot.

@Craig75 This may need to be verified with the R&D, while if you actually don't encounter any issue with the modem usage, you may ignore it.

@DanielWW Hi, if you want to take full advantage of the Ethernet ports, you may choose Option 1, then connect the main modem's LAN port to the WAN port of the VR400, you will then have all the 4 LAN...