iOS 4.2 [HowTo] Fix Multitasking on Older devices!

Credit goes to an Unregistered user, GuitarMan0121. Thanks bro!

As some of you may know, Apple borked multitasking for older devices just to be mean to us. Well we finally figured out how to make it work.

DO NOT use redsn0w to enable multitasking.. Do it manually, it has some issues and will screw with your device otherwise.
iPhone 3G = N82AP
iPod touch 2G = N72AP

What You'll Need
A jailbroken iDevice on 4.2.1(Orlly?)
Plist editor(iFile or whatever you have)
SSH

Let's Get To It!

Alright, open up WinSCP or iFile, and Navigate to /System/Library/CoreServices/Springboard.app and open up either N82AP or N72AP.plist.

Make sure Multitasking is enabled, if you don't see
<key>multitasking</key>
<true/>
Then add it.

Find the section that says
<key>opengles-1</key>
<true/>
Copt that entire section and paste it right below it. Now you should have it written twice. In one of them change the 1 to a 2. Respring and you can now switch apps from the multitasking switcher .

I have a weird line over my send button in my Messages?
Something like this?

Unfortunately this is a price we pay for Apple's mistake. There are no current fixes for this yet, and there maybe never will be.

What do you mean fix multitasking?
I didn't do the 2nd part to my device and multitasking works fine.

Open 2 apps. Try to switch to one while your in app.

EDIT

Oh your on 4.1.. This is in the 4.2 section for a reason lol

We do now.

Ah okay.
They already came out with a 4.2 jailbreak?

... Since the GM was out. redsn0w 0.9.6 B4. Don't enable anything though, it will mess with your device. Just install Cydia.

I have the MC model, does that make any difference?
Because, I tried a few days ago and it wouldn't let me.

It doesn't support mc models on 4.2