This challenge is part of Fortnite Season 4 Week 4 Challenges and you'll have to hack a total of five Stark robots on the new Stark Industries location. These droids patrol the entire industrial complex, and can be aggressive!
Map
To hack a Stark robot, simply knock it down, then interact with it once it's on the ground. This is the same manipulation as a normal resuscitation on an ally.
The issue is that the Stark Industries location is a real battleground in early games. Dozens of players land there, and it's unlikely that within a week of the challenge's release, they'll let you approach the robots in peace.
You'll certainly have to grope your way through, landing if possible in contact with a droid — even if it means attacking it with a pickaxe! If possible, avoid trying to hack robots without being surrounded by walls.
Unfortunately, the Team Rumble mode won't be of any use to you this time since Stark robots aren't active there. If you have a few determined friends, a squad challenge may be a better solution than a single player.
Original content by Romain "Zorg" Becquelin.