This means that any hardware introduced after the release date will not be optimally supported (if at all) by Debian's stock kernel.
To update the kernel version we can use the backports repository:
https://backports.debian.org/Backports are packages taken from the next Debian release (called "testing"), adjusted and recompiled for usage on Debian stable.
To install a backported kernel, first add the repositories to your sources using this command:
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# apt edit-sources
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deb http://deb.debian.org/debian buster-backports main contrib non-free
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# apt update
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# apt install -t buster-backports linux-image-amd64
If Debian is being used to boot the system then the GRUB menu should be automatically updated to add the new kernel; the old kernel can be found in the Advanced Options sub-menu if there are any problems with the backport.
If Debian is being booted from another operating system's bootloader then the configuration will have to be updated to pick up the new kernel.
Forum member and MX Linux developer @stevepusser is hosting fresh backports of the latest kernel version and also backports of Mesa and the xserver-xorg-video- packages for nouveau, amdgpu & intel:
http://forums.debian.net/viewtopic.php?p=684553#p684553