No wifi connections with Windows 8.1 on Lenovo Flex 2-14

I got me a new Lenovo Flex 2-14 with Windows 8.1 on it yesterday, but I can't connect to my wifi network. In the tray there's always the red cross (not the yellow symbol) and no network is found at all.
I read that a lot of users experience this, so I tried multiple drivers but none of them works. I tried the one pre-installed on the D drive, the newest one from the Lenovo website and also some that I found via Google when I searched for my wifi-adapter (it's a Realtek RTL8723BE). But as I said, no driver works.
Does anybody have an idea what I could do? It's a completely new notebook, so I didn't change any settings.
Thank you!
Solved!
Go to Solution.

Actually I have no idea what wireless adapter I have, on the Lenovo page both drivers are listed. When I install the Realtek driver I at least see an entry in the Device Manager, whereas when I install the Intel driver nothing happens at all. I deinstalled the Intel Tools and reinstalled the Realtek driver afterwards, but nothing changed.
In my router's settings I can only choose between channels 1 to 13, as far as I know these are at 2.4 GHz, right?

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Let me know the out come so that I can continue to work with you.
Please click the Thumbs up icon below to thank me for responding.
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Thx

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