It's now way easier to add a dope custom boot screen to your Steam Deck

pcgamer.com:

People have been adding crazy cool boot screens to their Steam Decks(opens in new tab). We've seen super cute animation start up screens mimicking favourite TV shows like Frasier, Cowboy Bebop, and Futurama. 

Monkey Island has been given a fan-made nod as a Steam Deck boot screen timed perfectly with the release of the new game. There are already so many lovely fan-made boot screens for the Steam Deck you're easily spoiled for choice, it's just the implementation that's been a bit tricky.

Previously, if you wanted to add your custom boot screen to the Steam Deck you'd have to follow a guide, like the one put together by Gaming on Linux(opens in new tab). It wasn't too difficult, but Valve has kindly made it much easier in the latest Steam Deck client beta update(opens in new tab). Hopefully they'll make it much easier to buy one soon too.(opens in new tab)

After seeing the communities love for custom boot scenes, the team has tweaked the Steam Deck so it will automatically look for these files. This means all you have to do is create a steamui/overrides/movies/folder on your Steam Deck and throw any boot or suspend animation video files you want to use in there. 

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This makes adding your own custom boot animations far easier than before, because you don't have to also tell the Steam Deck to go looking