I have a NodeMCU board with a broken UART module. So I tried to program the esp8266 via an external CP2102 breakout board. I have powered the NodeMCU directly with 3.3V on the 3.3V pin and connected TX/RX/GND of the CP2102 breakout board.
I am able to receive the "ets Jan 8 2013,rst cause:2, boot mode:(3,7)" via the serial monitor of the arduino ide. But I just get an error when I try to program the esp826 with the arduino ide:
warning: espcomm_sync failed error: espcomm_open failed error: espcomm_upload_mem failed error: espcomm_upload_mem failed
What I am doing wrong? I am pressing Flash, tap reset and release the flash button on the nodemcu board.