ESP8266 Community Forum

- Mon Oct 05, 2015 3:28 pm #30588 Hi!

After upgrading to El Capitan I can't flash no more.

Adafruit Huzzah ESP8266 (ESP-12)
Arduino UNO w/o arduino chip as serial adapter at 115200
Using latest stable Arduino IDE and I get this error:

warning: espcomm_sync failed
error: espcomm_open failed

I can use the serial monitor and communicate w/ the ESP from CoolTherm, but can't flash!!
Even tried esptool.py and I get a connection error there to.
The exact same setup worked before El Capitan and still works in Windows.

I can load sketches on to a Mega w/o problem, it's only the ESP that does not work.

What could El Capitan messed up?

Best regards, L

- Tue Oct 06, 2015 5:33 am #30643 I'm going to upgrade to 10.11 today, will take a look.

- Wed Oct 07, 2015 4:01 am #30765 Same here
First I also had driver problems so the esp didn't show up in /dev/ but fixed that by installing the drivers you get at codebender.cc
I assume it's a problem with non-signed drivers
But in the arduino IDE I get the same error messages.
Regards, Marco

- Wed Oct 07, 2015 6:13 am #30776 Hey,

after reading this post i tried it on my working machine with Yosemite running and i’m getting the same error messages.
So doesn’t seem to be a specific problem of El Capitan.

regards, Marco.