ESP8266 Community Forum

- Sun Oct 11, 2015 10:04 am #31098 I have the same problem. I upgraded to El Capitan yesterday and now I can't flash my ESP-1. It does recognize the serial port because I can get debut output. I've tried a couple of different ESP-1 devices. No luck. I've seen references to device signing issues.

Error messages

Sketch uses 257,344 bytes (49%) of program storage space. Maximum is 524,288 bytes.
/Users/davidwilson/Library/Arduino15/packages/esp8266/tools/esptool/0.4.4/esptool -vv -cd ck -cb 115200 -cp /dev/cu.usbmodem14211 -ca 0x00000 -cf /var/folders/mz/d9j7rvpx33jfdx38m1gtpzc80000gn/T/build4218092617509108676.tmp/ESPNightwatch.cpp_00000.bin -ca 0x10000 -cf /var/folders/mz/d9j7rvpx33jfdx38m1gtpzc80000gn/T/build4218092617509108676.tmp/ESPNightwatch.cpp_10000.bin
esptool v0.4.4-5-g744c44d - (c) 2014 Ch. Klippel <ck@atelier-klippel.de>
setting board to ck
setting baudrate from 115200 to 115200
setting port from /dev/tty.usbserial to /dev/cu.usbmodem14211
setting address from 0x00000000 to 0x00000000
espcomm_upload_file
stat /var/folders/mz/d9j7rvpx33jfdx38m1gtpzc80000gn/T/build4218092617509108676.tmp/ESPNightwatch.cpp_00000.bin success
opening port /dev/cu.usbmodem14211 at 115200
tcgetattr
tcsetattr
serial open
opening bootloader
resetting board
trying to connect
setting character timeout 0
done
setting character timeout 1
done
espcomm_send_command: sending command header
espcomm_send_command: sending command payload
trying to connect
setting character timeout 0
done
setting character timeout 1
done
espcomm_send_command: sending command header
espcomm_send_command: sending command payload
trying to connect
setting character timeout 0
done
setting character timeout 1
done
espcomm_send_command: sending command header
espcomm_send_command: sending command payload
resetting board
trying to connect
setting character timeout 0
done
setting character timeout 1
done
espcomm_send_command: sending command header
espcomm_send_command: sending command payload
trying to connect
setting character timeout 0
done
setting character timeout 1
done
espcomm_send_command: sending command header
espcomm_send_command: sending command payload
trying to connect
setting character timeout 0
done
setting character timeout 1
done
espcomm_send_command: sending command header
espcomm_send_command: sending command payload
resetting board
trying to connect
setting character timeout 0
done
setting character timeout 1
done
espcomm_send_command: sending command header
espcomm_send_command: sending command payload
trying to connect
setting character timeout 0
done
setting character timeout 1
done
espcomm_send_command: sending command header
espcomm_send_command: sending command payload
trying to connect
setting character timeout 0
done
setting character timeout 1
done
espcomm_send_command: sending command header
espcomm_send_command: sending command payload
warning: espcomm_sync failed
error: espcomm_open failed

- Mon Oct 12, 2015 12:11 am #31144 Same issue with me.
In El Capitan with Arduono, or with Ubuntu under Fusion VMware.

- Mon Oct 12, 2015 11:22 am #31175 Same error but running Yosemite 10.10.5

- Mon Oct 12, 2015 5:23 pm #31199 found this issue on Github but didn’t understand what is meant with Flash button - maybe this helps someone of you guys
https://github.com/esp8266/Arduino/issues/845