ESP8266 Community Forum

- Tue May 15, 2018 11:17 am #75936 Hi, i was working fine with my boards but for some reason now, the NodeMCU Esp8266 Lolin V3 doesn't blink
. When i connect the usb the led blink fast and turn off , and the board doesn't works. And i can't to send any sketch.

warning: espcomm_sync failed
error: espcomm_open failed
error: espcomm_upload_mem failed
error: espcomm_upload_mem failed

Just connecting a GND to D4 the board light the led. Seems the board burned.

I have tried to flash the firmware, change the usb cable, ...

- Tue Jun 12, 2018 12:55 am #76403 on Espruino you have to target pin not by D4 but NodeMCU.D4