Boot partition not showing up after SteamOS 3.4 update ✅ FIX
If you have a dual boot system with Windows 10 or 11 and SteamOS on your Steam Deck, updating to the new SteamOS 3.4 version may have caused your boot partition to disappear. Here's how to recover it.
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Commands used:
passwd
sudo efibootmgr -c -d /dev/nvme0n1 -p 1 -L "SteamOS" -l \\efi\\boot\\bootx64.efi
sudo efibootmgr --verbose