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Any firmware loaded during the installation will be copied automatically to the installed system. In most cases this will ensure that the device that requires the firmware will also work correctly after the system is rebooted into the installed system. However, if the installed system runs a different kernel version from the installer there is a slight chance that the firmware cannot be loaded due to version skew.
If the firmware was loaded from a firmware package, debian-installer will also install this pack- age for the installed system and will automatically add the non-free section of the package archive in APT’s sources.list. This has the advantage that the firmware should be updated automatically if a new version becomes available.
If loading the firmware was skipped during the installation, the relevant device will probably not work with the installed system until the firmware (package) is installed manually.
Note: If the firmware was loaded from loose firmware files, the firmware copied to the installed system will not be automatically updated unless the corresponding firmware package (if available) is installed after the installation is completed.