Trying to install firmware updates for my Dell gives the following error message:

The input is not of cabinet format

The solution is to install the update manually from the command line using fwupdmgr:

1)fwupdmgr get-updates
2)fwupdmgr update

You can find additional information about fwupd in Arch linux wiki: https://wiki.archlinux.org/title/fwupd