Is yours TL-MR3020 or TL-MR3220? If it is TL-MR3020, there is AP mode on it.

How do you use the router in AP mode? So you avoid the WAN interface and connect it by LAN port to use it as a wireless switch? Where did you enter the static IP details provided by your ISP? I guess...

E3276 is a LTE 4G modem. The MR3420 V2 supports 4G modem; while V1 does not. This is announced on TPLINK website.

4G LTE Modems Compatibility apply to TL-MR3040 Version 2.0 ONLY, which is found on TPLINK website. Is yours V1 or V2? Actually, i don't find the router's compatibility list accordingly to Greece; I...

Sorry I am not sure whether it is normal or not. There is no such an option on the router to check if it is forcing the modem to register only on 4G. For further details, you may send the syslog to...

The default working mode is AP mode. Before you access 192.168.0.254, you need to connect your PC to it by cable and set a static IP address for your PC. Here is an instruction...