BIGBRUNO For the time being, we recommend updating the system using Pamac in graphical mode for most users, as it is used to update packages from the repositories, the AUR, Flatpak and Snap.
At some point we should use some update script, but we also have to think about including Flatpak and Snap.
Might want to have a look at topgrade and see if it will work for BigLinux or can at least be modified to work with BigLinux. In Garuda I run update which invokes garuda-update then when that is done I run topgrade which updates EVERYTHING else. In Arch and other Arch based distros I simply run topgrade.