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I bought TP-Link Archer T2Ub from Amazon to get wifi from their TL-WR850N router(2ghz only) in my room. But I'm getting like 1mbit/s while getting around 30-40 mbit/s on my smartphone. Can't use wires. Should I try buying something else? I also have an old Dlink Dr 615 though not sure if it works and don't have its adapter.