Thank you for your answer. Actually, I didn't install the firmware manually in the folders /lib/firmware, but installed them by installing these packages from the debian repo.
[INSTALL, DEPENDENCIES] firmware-amd-graphics:amd64 20201218-3 [INSTALL, DEPENDENCIES] firmware-misc-nonfree:amd64 20201218-3 [INSTALL, DEPENDENCIES] intel-microcode:amd64 3.20201118.1 [INSTALL, DEPENDENCIES] iucode-tool:amd64 2.3.1-1 [INSTALL] firmware-linux-nonfree:amd64 20201218-3 [INSTALL] firmware-realtek:amd64 20201218-3 I would have expected the installer to detect automatically that these packages are needed and propose to install them (since I chose to use non-free repo also). Process could be something like that: tell the user during installation which additional firmware may be needed, that it may require non-free packages. Then ask if the user want's to use them, and in case he does, download and install the packages. If it is too difficult to identify which firmware might be needed, maybe just provide a list of firmwares (free and/or non-free) that can be installed (since official deb packages exist) and that the user can tick for installation I understand the process of adding the firmware through an USB key (for example), but for having already tried that in the past I found it rather complex. I thought putting the debian package on the USB root would have been sufficient, but it wasn't that simple. If I remember well, package had to be decompressed. I will give a try at the nonfree firmware ISO (for the missing firmware at 1st boot issue) & with UEFI (for graphical problems at boot on install DVD). Kind regards Fab
