Sonoff Tasmota

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Hi,
I did not know in which forum I can ask this question or problem so I do it here. I have a Sonoff S20 and a Sonoff Basic. I flashed them both with the Tasmota firmware. My problem is that the Sonoff’s don’t connect to the WLAN(FRITZ!Box Fon WLAN 7390) or don’t open their own WLAN. What could be the reason? Is it not allowed to enter special characters in the SSID? SSID is entered correctly as well as the password. Flashing also worked after Atom (so I get a successful message). Can someone help me?
Thank you

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@keule2
So with the current tasmota versions a wifi connection is established after flashing and the following restart of the ESP. The blue LED flashes every now and then, then the ESP tries to establish a WPS connection.
Of course the router has to wait for WPS.
Did you switch on WPS at the router when the ESP tried to connect?

Hi,
i flash my sonoffs with the videoguide of TechnikSchwabe. I write SSID and Password in the configfile and it works. A SonOff-Basic in my equipment is after flashing in the AP-Mode -----> new flashing and he find my wlan.
MfG.

I got it. I reinstalled Atom and Tasmota after that it works. Thx for your help.