Ghost client at my network, Unknow device, need help

Hi guys, i just bought the RT-AC5300 and there is a client at my 2.4Ghz wifi that insists to appear, the sinal of this device is very week and it`s of from my DHCP range list, can someone help me to find what is it and if i need to leave it there and if not how to remove this device?

Will post some images here


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Te devoce is from Hon Hai precision Ind Co Ltda

really need help

Thanks