(SPOILER) How to secure Quarian and Geth peace in ME3 from ME2

Securing peace is a pretty hard thing to do, so here's how.

Requirements

In Mass Effect 3, one of the most important plot points is to fix the Geth/Quarian conflict. Choosing either sides makes the losing side wiped off the face of the galaxy. So how do we save both sides?

In order to do this, 3 important things must be achieved in ME2 and ME3.

ME2
- Both Tali and Legion have to survive the Suicide Mission.
- Legion can not be sold off to Cerberus.

ME3
- The mission Rannoch: Geth Fighter Squadrons must be completed.
- Shepard must have at least four bars of Reputation.

Got it? Good. Let's go make some peace.

What you need to do

Achieving peace uses a point system that determines your ability to make peace from ME2 and ME3 decisions. In order to achieve peace, you must have 5 points.

ME2 (aka the major ones)
(+2 points) In Legion's loyalty mission (Legion: A House Divided), your final decision comes down to either rewriting the heretics, or destroying them. Destroying them is the right choice here.

(+2 points) In Tali's loyalty mission (Tali: Treason), there is a chance to fail. If you present the evidence, Tali is exiled. If the loyalty mission is completed successfuly and Tali is NOT exiled, 2 points are earned. The way save Tali from exile is to either use charm/intimidate in the hearing or, if Shepard spoke to the Admirals about their motivations, Veetor and Kal'Reegar are present, and Shepard asked them for their help before leaving for the Alarei, Shepard can rally the crowd. The option is only available if Veetor was returned to the Fleet instead of Cerberus on Freedom's Progress and Kal'Reegar survived Haestrom.

(+1 point) After both loyalty missions are complete, Legion and Tali will have an arguement. Choosing a side during this arguement will NOT give you the point, and the losing side in the argument will not be loyal (which will likely get them killed anyways). In order to secure both loyalties, Shepard must have a high enough Paragon/Renegade score and must choose either charm or intimidate.

ME3
(+1 point) Completing Rannoch: Admiral Koris.

(+1 point) Saving Admiral Koris during Rannoch: Admiral Koris. To save Koris, Shepard must refuse his orders to leave him. To do this, you must have a high enough Reputation. Letting Koris die isn't a smart decision anyways, you lose 75 war assets.

Why should you do this?

If you do not secure peace, you must choose a side. The side which you did not choose will be wiped out, and their representative will die.

I repeat, IF YOU DO NOT SECURE PEACE, TALI OR LEGION WILL DIE AND YOU WILL LOSE ALL WAR ASSETS RELATING TO THE PERSON WHO DIED.

Furthermore, if resolved with co-existence, talking to Tali afterward onboard the Normandy will reveal that the geth are providing invaluable assistance in helping the quarians resettling onto Rannoch. They set up housing and settlements in a far more efficient manner, and volunteers are having their suits loaded with geth programmes that function in mimicking mild virus attacks, which in time will help to boost the quarians' natural immune systems so they can live normally without the environment suit. Tali admits that she can't see the quarians actually ditching the suit altogether, however, as it has become part of their culture.

[Geek_Haven]

Blizzard Wolf. well if you check the numbers you will see that even when you rewrite the geth is is still possible to get 5 threshold points, if you destroy Geth you are getting 7 points.

[Bullet Kin]

ik this is an old guide but i still need help: do you know where I can edit the points in with a save editor?

[Blizzard Wolf]

I find it strange since when I played the console version on 360, I rewrote the geth instead of destroying them, then later on ME3, after doing everything from all 3 games, DLC included, I got both of them to co-exist on Rannoch

[Lord Sola Cat]

I found it.

[Raider]

There's a specific way to handling that conversation. Look up a guide, I don't remember what you have to do.

[Lord Sola Cat]

Ashley killed him

[Lord Sola Cat]

how? cause i thought i did everything right then one of my crew killed him

[Raider]

...don't kill him in ME1?

[Lord Sola Cat]

i own the trilogy on Origin

[Lord Sola Cat]

anyone know how to have wrex appear in ME2?