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This article or section refers to "enhanced version" content in the Xbox One, PlayStation 4, and PC renditions of Grand Theft Auto V and/or Grand Theft Auto Online, that is absent on the Xbox 360 or PlayStation 3 versions.
For a complete list of the features of the "enhanced" version of Grand Theft Auto V, please see here.
V
"You know, I once got turned down for a comp-sci professorship over at ULSA. So... in retribution I hacked their staff server and left a back door so wide a drunken freshman could stumble through it. Ah... anyway, thanks to my incredible foresight, I know they have a piece of experimental R&D that might be of interest to you: and EMP device, capable of knocking out an entire casino's worth of electronics for several crucial minutes. Now, this thing weighs a ton, so you're gonna need a Cargobob."
―Lester's briefing.

EMP Device is an optional prep mission featured in Grand Theft Auto Online as part of the The Diamond Casino Heist update. It is a freeroam mission needed to progress The Diamond Casino Heist. Completing this setup allows players to knock out the power for a short time in the Casino during the Silent & Sneaky approach.

Overview

Lester informs the player that he found some information on an experimental EMP Device being developed by ULSA that the player can use to knock out the power to the Casino during the heist, but that they need a Cargobob to steal it.

The player heads to LSIA to steal one, then heads to ULSA's campus. The EMP is being worked on at a semi-random location on-campus, and is open to be hooked up to the Cargobob and taken away. The campus security guards nearby will start shooting at the player and they will gain a three-star wanted level.

After escaping the police, Lester directs them to drop off the EMP at the LSDWP Vinewood Substation across from Casino, after which the mission is completed.

Lester Dialogue

"Alright, now... here's the thing about highly classified prototypes: I don't know exactly what this thing is gonna look like. Big would be a soild guess. Maybe green? Probably glowing. Don't worry, it's almost certainly safe. You'll know it when you see it, so... just get it hooked up and get outta there."
―After reaching ULSA.
"Alright, now I cannot stress this enough. Do not drop it. I have no idea what will happen, but the range of possibilities starts with international incident and gets worse from there. Get it over to its new home at Los Santos Water & Power, right across from a certain casino and resort..."
―After stealing the EMP.
"And now you've got some heat on ya."
―After getting a wanted level.
"Get it over to Los Santos Water & Power. Oh and, uh... don't break it."
―After losing a wanted level.

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