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Here's how to restore SteamOS boot entry after installing SteamOS 3.4 update

1.Start with Steam Deck off.

2.Hold Volume + button and power.

3.Choose "Boot from file".

4.Select esp/efi/steamos/steamcl.efi.

5.Wait until SteamOS boots (there will be a blank screen for some time, but Steam should start after that).

6.Go to desktop mode.

7.Open Konsole.

8.Run following command:

9.sudo efibootmgr -c -L "SteamOS" -l "\EFI\steamos\steamcl.efi" -d /dev/nvme0n1p1

This will add a boot menu option for SteamOS.