ESP8266 Community Forum

k2r79 wrote:Hi,

I got the same problem of my MacOS Big Sur since the update and I did the following :

1. Download https://github.com/espressif/esptool/archive/v3.0.zip
2. Download https://github.com/pyserial/pyserial/archive/v3.4.zip
3. Extract the contents to esptool/ and pyserial/ in the ~/Library/Arduino15/packages/esp8266/hardware/esp8266/2.7.4/tools/ folder (an equivalent must exist on Windows)

Everything works now

Hello and thanks for your information. I made the update to Big Sur last week on my MacBook Pro late 2018. I worked two days before without any problems with my ESP8266 (compilation and upload). After the update I got the same error report. During seaching a solution I found this forum.

After I changed esptool and pyserial like you described the upload was still not possible and there is still the same error report. I started all new, no success.

Does anyone has an idea what I could do more?

Thanks and best regards!

Worked for me also, thanks!

Hello, thanks for the solution, you just miss to tell to remove the old folder and rename the new downloaded as esptool and pyserial

Thanks again

Hello, when I told it does not work, I made a mistake by choosing the directory. Now I fixed the problem and it works fine!

Thank you very much!