It's time to play Simon in Fortnite. You'll have to complete four rounds of this puzzle before your Fortbyte unlocks.
Land in the desert at grid I9 and you'll find a contraption behind a shed. All you have to do is activate the game with the switch, practice your memory skills a few times, and the challenge is complete.
When I was doing this, there was an opponent waiting patiently for me to finish. Afterward they killed me, but it was nice of them to let me get the Fortbyte first. Hah.