I'm trying to disable the BIOS/firmware update, I had a bad experience with the automated process, I rather do it manually. It bricked my computer, motherboard had to be replaced, luckly I had warranty.
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The software responsible for this type of update is
fwupd is a simple daemon to allow session software to update device firmware on your local machine. It's designed for desktops, but this project is also usable on phones, tablets and on headless servers. You can either use a GUI software manager like GNOME Software to view and apply updates, the command-line tool or the system D-Bus interface directly.
To get rid of the updates you can uninstall
sudo apt-get remove fwupd