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From snapcraft.io — the developer's official site. AvatarDesktop doesn't host, re-package or modify files.

How to install uefi-fw-tools

Click Download — the developer's official website opens in a new tab.
Download the latest version there and run it. Choose Custom/Advanced where offered, and skip any bundled extras.
Prefer the command line? With Snap you can install and update it with: sudo snap install uefi-fw-tools
Open uefi-fw-tools once it finishes installing.