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What error do you get when you try and connect?
Ok, so its a problem in scanning for them, not connecting to them. Which make and model Android tablet are you using?
One more question, have you ever been able to connect to a WiFi network and its just now getting the error. Or is this the first time you're connecting to WiFi or its a new tablet.
Okay since you just bought it, you wont be losing anything from months of playing on it. We need to do a factory reset to see if its a software or hardware problem.
Go to Settings, then choose Privacy and then select Wipe Data / Factory Reset (sometimes you wont have a Privacy option, and the factory reset option will be the in the Storage & SD Card menu under Settings).
After you complete the reset, tell me if it can scan and find your networks. If not, its a hardware issue and you will need to return the device.
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Sorry for the bad news. If its not able to find the networks at least we now know that its hardware and not software, and you have reason to return it for your money back!