Say more about what you have tried and where in the procedure it "fails" and what any error messages are saying.
Is the Deco system brand new - and if so have you registered it on the TP-Link website first?
Is all ok without the Deco's? Are yiu sure that they just arent borked !
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John
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I do not work for VM. My services: HD TV on VIP (+ Sky Sports & Movies & BT sport), x3 V6 boxes (1 wired, 1 WiFi, 1 on PA) Hub5 in modem mode with Apple Airport Extreme Router +2 Airport Express's. On 250Mbps, Talk Anytime Phone, x2 Mobile SIM only iPhones.