@droftarts
Ok. Anyway, thanks for the support. You helped me a lot. If necessary, I can replace it with ESP-07S, if that helps. I still have to check the config.g and maybe adjust something.

@droftarts Thank you for your reply.

on m122 received the answer Firmware version 2.1.0 and after rebooting the network is not saved. response to command m587 - Remembered networks: none.

After command M997 S1 P"0:/sys/DuetWiFiServer.bin" Firmware version 1.27 is established

It turns out that firmware version 2.1.0 does not work with my Wi-Fi module. I don’t know how important this is, but some time ago I replaced the Wi-Fi module with a module with a plug-in antenna.

I didn't think that such problems could arise.

Hello everyone who will read this to help me or find answers to their questions.
I apologize for the way I write. I am not very familiar with English)

I have been using DUET2WIFI ​​for a long time, although not much. Everything worked fine on version 3.2 or so. Immediately upon installing update 3.5.2 - which I threw through the web, Wi-Fi stopped connecting. When power is supplied, the blue LED flashes briefly once for a moment.

When connecting USB and terminal it writes.

After several commands, DUET connects to the WiFi network

After reboot, wifi connection does not occur. In config.g, the M552 S1 command is present.

In the console it says
Error in macro startup file, line 51: Heater 1 not found.
But I don't think it's related.