@Sunshine Hi, > Do you mean the MR3420 V5 doesn't detect the USB modem no matter the USB modem is connected before or after the router powers on? No, the issue only occurs when the modem is connected...

H, I have two TP-Link routers type MR3420. The HW versions of these routers are different. One has V2.4 and the other has V5. I use these routers witth the same USB mobile stick type Huawei...