ESP8266 Community Forum

When I first started working with the ESP8266 Wemos D1 Mini, it was just working fine. Suddenly, it started to act very weirdly. It does not run the application and every time I restart it, it shows some weird messages on the Serial Monitor. When it first started, I got this message:

"ets Jan 8 2013,rst cause:4, boot mode:(3,6) wdt reset load 0x4010f000, len 3664, room 16 tail 0 chksum 0xee csum 0xee v39c79d9b ~ld"

Today, I got something that is not understandable, keep in mind that I know that I have to put "Serial.begin()" and set the serial monitor with the same Serial speed on the sketch. To program it, I chose "LOLIN(WEMOS) D1 R2 & mini" board from the tools menu. And the rest of the options are the same. This is the board that I have:

https://www.aliexpress.com/item/32635160765.html?spm=a2g0o.productlist.0.0.4c9949128BUQGT&algo_pvid=b830f932-5367-4104-a0b8-813380ac6215&algo_expid=b830f932-5367-4104-a0b8-813380ac6215-0&btsid=0b0a01f815970733699413411e5e96&ws_ab_test=searchweb0_0,searchweb201602_,searchweb201603_

I chose "LOLIN(WEMOS) D1 R2 & mini" board

Did you try any other board types?

The D1 minis I have used work with board type 'NodeMCU 0.9 (ESP-12 Module)

you have to put
Serial.begin(74880)
and set the serial monitor to 74880 to see the "something not understandable" message as well as the output of your sketch.