Strange issue with wifi!11!!1!

Gentlemen,

i've a problem:

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|  __|___ ___ ___ _ _|_|___ ___
|  __|_ -| . |  _| | | |   | . |
|____|___|  _|_| |___|_|_|_|___|
         |_| espruino.com
 2v05 (c) 2019 G.Williams
Espruino is Open Source. Our work is supported
only by sales of official boards and donations:
http://espruino.com/Donate
Flash map 4MB:512/512, manuf 0x20 chip 0x4016

I try to connect to an ap via:

var wifi = require("Wifi");
wifi.connect("Bratatatat-666", {password: "SomeThiNGLIKeTh8t"},
   function(err){
  if(err)console.log(err);
  else console.log("connected!");
});

and i get "bad password" or stock in "connecting" but i can swear the password is absolutely correct. 100%!11!!1!

My router is available on 2.4 and 5 GHz and with another MC, wich is not flashed with Espruino, there is no problem to connect.

Please help!

If i connect to an mobile-hotspot, wich has password like "espruino1337", the connection is successfull.