Gica you are confusing yourself just follow any of the 2 guides on post #2 you don't need to know the ip of your root router I posted you put back your wireless adapter from lap top to obtain ip...

http://www.tp-link.us/article/?faqid=348 http://www.tp-link.us/article/?faqid=318 ignore on both the security step reset your 5210 to factory default, both configurations will give you internet via...

all i can add about office/shed 25m away. lower the Transmit Power: of both CPEs short distance for this devices.Wireless/Wireless Advance/ Transmit Power, change to Low and uncheck Enable High Power...

do you have a router at point #2 to connect the LAN cable coming from 7510 #2 or all your connecting devices are on 5Ghz band if not, get a router any, and just disable DHCP to make it a AP and...

Read this thread and apply post #6 it could help http://forum.tp-link.com/showthread.php?2892-Adapter-won-t-turn-on-at-startup&p=8711#post8711

did you read post #6 because you are not posting about it