Thanks. I'll try this.

@Naranjito The problem is partially fixed. My internet service provider had not properly activated my SIM card. However, the router does not go beyond one bar of signal strength.

Hi. I just recently bought a TL-MR6400 router V4 and I'm not getting a signal at all. I followed all hardware connection instructions but when I switch it on, only the power and Wi-Fi LEDs come on....