Updating: other images
The distro updates itself like on any PC; the PS5 kernel comes from the package repository or from Kernel setup, not from the distro.
Update the kernel
A kernel update on an M.2 install has left some users with a black screen or a kernel that doesn't match its modules. Read Kernel update breaks M.2 boot first.
One command for any distro:
curl -fsSL https://repo.etawen.dev/update-kernel.sh | sudo sh -s -- --no-reboot
It detects your package manager (pacman, apt, dnf, dnf5 or rpm-ostree), adds the repository first if needed, skips ps5-linux-mwifiex when your kernel already includes the driver, and with --no-reboot leaves the restart to you: the new kernel runs from the next start with the loader. Without it, the script reboots by itself when the kernel changed.
On rmuxnet's kernel, install the new release the same way as the first time, see Install rmuxnet's release.
Update the distro
Update with your package manager as usual, with the stock kernel held so that the distro doesn't replace the PS5 kernel, see Hold the stock kernel.
Go back to an earlier kernel
Every tagged upstream release is mirrored, so you can go back to an earlier kernel, for example after a kernel update that broke an M.2 install.
Arch: the pacman database only lists the newest version, so install older ones by URL. Browse repo.etawen.dev/arch for the file name:
sudo pacman -U https://repo.etawen.dev/arch/linux-ps5-<version>-x86_64.pkg.tar.zst
Debian / Ubuntu:
apt-cache madison linux-ps5
sudo apt install linux-ps5=<version>
Fedora / Bazzite:
dnf --showduplicates list linux-ps5
sudo dnf install --setopt=gpgcheck=0 linux-ps5-<version>