Attempting to preload the game will present a message that Wine, Proton and Steam Deck are not supported. This is likely due to Javelin, EA's in-house kernel level anti-cheat software.

Also note that Javelin requires secure boot, setting high IT expertise requirements to all linux users to enable this 'feature' on their operating system. This includes ALL steam deck users; you don't have secure boot enabled by default!

Preloading and beta testing Battlefield 6 can be done FOR FREE until the end of beta on august 17.