What is om0?
om0(=on mission zero/0) is a state in the game which tells whether you are on a mission (om1) or not (om0). You can trick the game in multiple ways to lose the om1 state in a mission and become om0. I will name the two discovered ways which by the way, both need a rampage (there is one more way to get om0 but that one is unneeded. It can be acquired with a rampage and the first mission. I won't talk about this method though)
How can you reach om0 in a mission?
Om0 method one, works on ps2 and psp only and is kind of tricky.
Video by Odyssic
Enter a firetruck and hold the "start firefighter" key. Then leave the Firetruck, stop holding down the "start firefighter" key and enter any rampage at the same time. The rampages state is now on mission 0 because two missions were running at the same time and one failed.
Om0 method two works on all platforms
video by Lennart -
Start a rampage, park a car that can start a side mission (police car, enforcer, FBI cruiser, tank, firetruck, taxi, bickle '76, cabbie, ambulance or trashmaster) next to it and wait for the timer to hit 0:00. Then enter the vehicle and spam the "start side-mission" key which will result two missions running at the same time. If you fail one of them, either the side mission or the rampage will now be om0.
How can you keep om0 without the rampage limit?
Preserve om0 for more than 2 minutes psp/ps2/mobile with controler
If you want to preserve the ability to change om1 to om0 for a longer time than two minutes, you have to use the Bumps & Grinds dupe.
Video by zazaza691
Video by Lennart -
For this, you need to get a police vehicle (everything but the Barracks OL) and a rampage. I recommend having none of the Bumps & Grinds courses passed or it will be harder to drive since everytime you drive forward, you need to steer to the right or left so none of the courses will be activated.
Having set up the normal om0 rampage (method one or two), just start vigilante while a rampage is still running. Then get to the place where you can start the side mission Bumps & Grinds and wait for the rampage to fail and set the vigilante state from om1 to om0. After this, enter the Samchez or after conpletion, Manchez and wait for the vigilante timer (60 seconds) to run out. You will realise, after the mission failed message appears, you gain control again but pressing O or Δ removes the course menu. X will start the selected course if available. To go around this, you use the left analog stick and pull it to the right or left and press the desired button. This menu will only disappear if you enter a gun shop or press one of the buttons named above.
What can I do with om0?
You can have two om0 changer running at the same time; om0 rampage and the preserved om0 with Bumps & Grinds. Starting a mission and failing the rampage results in the om1 state changing to om0 and you being able to start the mission again. This process is named duping or duplicating.
Pressing one of the buttons that will remove the menu will change the state to om0, again. If you now start the mission again, you tripled the mission. You guessed it, this is called tripling.
Video by you fooking w0t m9?
This can mess with the game and have some serious effects on the missions which will all disappear after saving the game and reloading that particular save (the effects, not the missions).
Why would I need om0/duping?
You can even obtain special vehicles using the methods named above because most of the time, starting a mission with a rampage and if the mission reaches om0, starting a side mission, removes the mission script and you can easily collect the vehicle. (There are more advanced/complex vehicles which all can be found in the GTA LCS Special Vehicle Guide
Passing a mission twice or even thrice, you can double up or treble the %-age that you earn through the mission. Unlike the other gtas, in lcs, no other missions will be skipped doing so.
You can get unlimited ammo for the m60 or the smg using om0 and rail shooters.
On mobile, you can technically get every rampage weapon with unlimited ammo.
Some cool and strange things can happen/be acquired with duping like being drunk
Or teleporting to the stadium (which is pretty annoying i.m.o.)
You want more than one Toni?
First of all, dupe Toni like shown a link before. Then start the mission Taking The Peace. All done. But there is a problem: we can't activate mission stuff with the Toni we are controlling but marker and collecting stuff. We will do some more research
You want to listen to the lcs theme in game?
Rational Psycho tried this for himself and it worked. What Noskillx doesn't explain, however, is that the theme stops playing when pausing the game, going to the other islands, starting "Car Salesman" etc. Also, it won't play if you have the radio muted in the audio settings.
Short on cash?
Here, have the highest amount possible.
Too frustrated with a mission?
Patrick B. and Husho worked on an instapass doc.
Pizza deliveries/Punk noodles:
You can instapass Pizzaboy missions (Both First Island & Second Island) by starting it with The Shoreside Redemption
Of course Set up om0 with Shoreside Redemption, and just go to whatever Pizzaboy mission you want, game won't crash etc.
See the sight before your flight:
Start vigilante while om0 and then start StSBYF. Skip the cut scene and that's it! Bad thing that we must save and reload the game after that. So it could be useful for some levels, e.g. for Portland ones.
See the sight before your flight level skip:
Dupe and pass one level, the next one will be skipped but you receive double reward for the duped level
Here in this topic, I will collect all the things, om0 can do and I will answer (hopefully) every question you have to this topic.