Problems with V92 and wifi.save() on ESP8266 512K Flash Boards?

tested this images on a ESP8266 12 board

var wifi = require("Wifi");
wifi.connect("xxx", {password:"xxx"}, function(ap){ 
   console.log("connected"); 
  wifi.save()
});

result after reset

>rllœž|Œlà|Œlìb|Ž‚ì’r’bŒbŒònnžlnnœâìbpŒŽlrlrlpònà‚lbnâ|ŒŽbŒònnîlŒŽl`nnl`nrŽ’’n’’l`pònàrŒœœâàbnâ|쎎ŽbŒònnîl`nnl`nrŽ’’nŽlpònàrŒœœâàìlbnâ|ŒŽŒbŒònnîl`nnl`nrŽ’’n‚l`r’’n‚l`rlŒŒnœŒònnžŒžâŒrnnnŒlŒbŽlì’lì’’‚ŒŽlll~rlì’lllnœâŒl’lllì’lŒnàŽnì’n~ŒŒllà€bìŒllpb‚br‚Œìl`nlŽpŒìl`bl`l’’nžnŒ’ânlž|bll`rlŒâì‚nì’r‚òn|ìlŒl`Œâr’lŒþ

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Flash map 4MB:512/512, manuf 0xe0 chip 0x4016
>require("Wifi").getIP();
={
  "ip": "192.168.194.121",
  "netmask": "255.255.255.0",
  "gw": "192.168.194.1",
  "mac": "5c:cf:7f:c1:12:0b"
 }
> 

so it works