I agree to you it looks like a compatibility issue. Nevertheless I solved it with a flash to the DD-WRT firmware and afterwards my two modems worked without a problem. Sadly the quick configuration...

Model : MR3020 Hardware Version : V1 Firmware Version : latest, 3.17.2 Build 150921 Rel.62529n ISP : 3-AT Hi, i've a strange problem with a mr3020 and a plugged in huawei e398. The router says...