ESP32 Forum

Posted: **Wed Jan 24, 2018 10:35 pm**

Something was recently changed in ESP-IDF and now I can no longer program at 1500000 baud. The max it will do is 115200. Anything higher than that and I get:

A fatal error occurred: Invalid head of packet

Any ideas what could be causing this? Nothing changed but the esp-idf was updated. 1500000 baud used to work just fine.

Posted: **Wed Jan 24, 2018 10:41 pm**

https://github.com/espressif/esptool/issues/250

Posted: **Wed Jan 24, 2018 11:21 pm**

Hi kostyan,

What OS are you on and which esptool version are you using (it's printed in the output)?

esptool v2.2 (which was just updated on IDF master branch) had a bug with high baud rates which is fixed in v2.2.1. We'll be updating the version in ESP-IDF shortly.

In the meantime, you can update it yourself by

Code: Select all

cd components/esptool_py/esptool
git fetch origin
git checkout v2.2.1

If this doesn't resolve the issue, please provide more details about your host OS, development hardware, and full output from esptool.py.

Angus

Posted: **Thu Jan 25, 2018 3:45 pm**

ESP_Angus, thanks for help. Updating esp tool to 2.2.1 fixed the issue.

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