Unfortunately, i still have problems with nodemcu v3. The only way is to use firmware near mega-20181111.

I've also faced with this problem. I wrote 16mb empty file to device. After that you can write firmware. No disconnects. Works perfect. INIT : Booting version: mega-20200426 (ESP82xx Core 3d128e5c, NONOS SDK 2.2.2-dev(38a443e), LWIP: 2.1.2 PUYA support) 71 : Info : INIT : Free RAM:31136 72 : Info : ...

Use case: I have preconfigured device with several hardware sensors. I give it to my friend, he wants this device to be connected to his home wifi access point. Default behavior for inaccessible wifi AP is that device enters AP mode and user can connect to it via smartphone. Then user opens default ...