Custom Steam Deck boot animation GUIDE (old!)
658**OLD** see here: https://youtu.be/Gv2-9Kah_Ig
Here's how to change your #SteamDeck boot up animation to whatever the hell you want it to be!
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Truncate commands (ensure the correct filesize number!):
truncate -s 1840847 deck_startup.webm
truncate -s 38492 library.css
To find the "video" text in the CSS file, if you don't have a keyboard attached you can select the Find option from the Edit toolbar up top.
Inspired from this Redditor: https://www.reddit.com/r/SteamDeck/comments/xi3vno/comment/ip196e6/
You can use https://cloudconvert.com/ to convert to webm if you find that to be the simplest way.
Also, use at your own peril and don't blame me if you break it but here's some people working on scripts to help automate it, but again, use these scripts i have noted tested at your own peril:
https://github.com/AutoMcG/steamdeck_tools
https://github.com/BunnyStrike/deck_revealed/tree/main/boot_videos
https://github.com/kageurufu/steamdeck_startup_animations