ESP8266 Community Forum

Posted: **Thu Aug 27, 2015 10:29 am**

I have a NodeMCU dev kit that I've been using. Yesterday I setup the development environment on another computer, plugged in the NodeMCU and hit upload. The blue LED on the module blinked once, and then after a delay I got this message:

warning: espcomm_sync failed
error: espcomm_open failed

Does anyone have any ideas why I can program it just fine from one computer, but from another computer I get the messages above?

Thanks,
-- John

Posted: **Tue Sep 29, 2015 2:15 pm**

I have the same issue.

Posted: **Wed Sep 30, 2015 3:27 am**

if it's USB powered: supply problems
in general: driver problems

Posted: **Thu Oct 01, 2015 1:25 am**

John, roccomuso, which OS are you guys using?
Is this about NodeMCU 0.9 (yellow one) or NodeMCU 1.0 (black one)?

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