Some days ago, I wanted to program an ESP8266 module but somehow it sort-of always failed. Small program worked, but soon I added more into it, it started to fail. The upload process will get stuck and sometimes it eventually finished. But still, I could not get the program to run. If I checked through the serial console, I got the following message, or something similar.
ets Jan 8 2013,rst cause:4, boot mode:(3,7)
I also tried to do the connection more properly, by adding pull-up/down resistors and capacitor, but it did not help. Googling did not give the help that I needed until I someone mentioned to check the serial adapter. Could that be the problem?