Framework Arduino ESP8266, how to downgrade to 2.3.0 core?

Current version of PlatformIO framework is based on ESP8266-Arduino core v.2.4.1,
however if i want to downgrade to ESP8266-Arduino core v.2.3.0. How can I do this objective?

Thank you.

  • Redirecting...
  • PlatformIO IDE > PIO Home > Platforms > Embedded > Espressif 8266 > Changelog
[env:myboard]
platform = espressif8266@1.5.0
...

Thank you.

and if I want to use ESP-IDF current version from
GitHub - espressif/esp-idf: Espressif IoT Development Framework. Official development framework for Espressif SoCs. lastest dev. or lastest stable version( 3.1-beta1),
how to config them?