AVRBoards

How do I change versions of AVRBoards?
I have Arduino v. 1.6.12.

I assume by "AVRBoards" you mean Arduino AVR Boards:

  • Tools > Board > Boards Manager...
  • Wait until downloads complete.
  • Click on the "Arduino AVR Boards" entry.
  • Select the desired version from the "Select version" drop down menu.
  • Click the "Install" button.
  • Wait until installation completes.
  • Click the "Close" button.

Thanks for that