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By Bastler
k2r79 wrote:Hi,

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

1. Download
2. Download
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!