The decryption challenge number chip is obtained on condition that the Rox aerosol is used in an underground passage. Find its location easily with this guide.
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To find Fortbyte number 22 of the decryption challenge, go to Neo Tilted and pass under a street. It's the one where you find a truck. Don't forget to equip yourself with the "Rox" aerosol, which you can obtain at level 6 of the season 9 battle pass (paid version). You will have to use it near the chip to be able to pick it up.
The challenges and Fortbyte locations of the Fortnite Season 9 decryption challenge, as well as the complete list of Fortbytes, are to be found in this article.
Written by Augustin "TheGreatReview" Héliot. Translated from French by Millenium.us.org.