Why can't I connect to my router?

My internet speed is 40/20Mbps. I have got a TP-LINK TL-WR740N. If I set the wireless to N mode, I can't connect to my router with my laptop and my iPhone can't connect either (both are supporting B/G/N). Router works only in G mode, but in G mode I get only 20/20Mbps. What should I do? I already tried installing DD WRT firmware but I can't get the whole internet speed with this firmware, and neither with the factory firmware.
Sorry for my English.

Added (1). I'm learning in an IT school but I can't figure out what the problem is.

Call an expert///

Leave b/g/n mode in auto if option available, then look for channel selection, usually under the wan tab, usually set up to auto by default, try setting channel 1 or 6 or 11 since they do not overlap. Try connecting your devices with those 3 different settings. My daughter's laptop(mac) only "likes" channel 11. Also select forget those networks in both devices and try to connect as a new network when going through this settings changes. Also use wpa2-psk encryption for your password, its recommended… Good luck

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