how to safely open .upf files on my macbook

You’re not going to be opening a upf firmware file, you’re going to allow the Brother device to open that file.

The download page for whichever Brother device usually has step-by-step instructions for performing the update.

If you’ll like help with that update, please identify the particular Brother device you’re seeking to update.

Mbarrick wrote:

I am trying to update software on a brother product and it is .upf file. I need to open the file, but don't know which program to use safely.

Why do you have to open a upf file on your computer? Is this software for something like an embroidery machine?

Check the Brother page for specific machine install of upf files. Example:

https://support.brother.ca/app/answers/detail/a_id/138888/~/how-do-i-update-the-machine-to-the-latest-version-using-an-usb-media%3F