@azzoug Word of advice, don't buy TP. I regret buying one as either the password was configured incorrectly or TP as a company remotely changed the password directly themselves after installation. Their app is awful to use as it bars you for 2 hours if you get your password wrong, especially if they're responsible for setting it it seems. Their community is unhelpful and absent. Never buying a TP product again. I'd advise you don't. Find something else, please I beg you.

  @TP-sucks 

Why

I have been with TP-Link extenders for many years.
 I own 4 extenders .
Only when I changed the modem.
did I want to change the extender to the latest one

  @azzoug I'm personally frustrated at their lack of support as their app has created a new condition for passwords for the Range Extender itself. Neither default password, Host WiFi Password nor manually input password is valid per these new conditions, when I updated the app, my old temperamental phone is only able to maintain access to the app itself because it was already logged in prior to updating. It's not user friendly at all to impose a new password, not inform the customer until they update the app and bar access to aforementioned app on new devices. I'm beyond frustrated right now. 

  @TP-sucks They're unlikely to make further changes to the password settings but as of right now I'm blocked from my own Range Extender and not getting any support, hence my angry profile name. They urged me to have a profile name along with the email. Discovering such as I have beef with them is a bad combination. I've had an email with TP-Link for over a year. Didn't need to access the forums or anything until now.

  @terziyski 

I bought a re700x..v2 eu

Same result

Even if it is only one meter away from the modem

Now I have four wifi extenders
It seems the problem is in the modem itself VX1800V
It needs to be updated to be compatible

Because I tried with the old modem vr400

And the result was great

  @terziyski 

Thank you for this cooperation

I tried changing the channel width.

But not the desired result

I bought this modem on the basis that it is the latest.

And the result is not as I expected

I wish one of the technicians from the company would intervene

And answer us the reason