@macmax1718 Can we confirm who is the OpenVPN provider in this network? BTW, the firmware we provided in the OP is built for AX20 v1 and V1.20, so it cannot be uploaded into V2 version.

@John_Titor Have you ever tested the internet connection with another router (from another manufacture)? Will it connect automatically with "Triangle ltd." line/modem? Or you can simply dial up on...

@sivakumarms Yes, please. Let me know if the replacement will work properly or not.

@zakporter Sorry. What's the model number of your TP-Link device, please? We will confirm.

@sivakumarms You have done all that I can think of. Just to be sure, both the 2.4G and 5G disappear at the same time? How did you recover the connection? If the router is purchased recently, we would...

@RaduTen Upon checking this compatibility list, the huawei E3372h-320 is not in the list, which means the compatibility is not guaranteed:...