How to enable Multitasking feature in iphone 2g and 3g

Alright, In my previous Post I explained Multitasking in iPhone 4G .Do you like this new multitasking 4.0 software on the iPhone? Well now you can have this multitasking feature in your iPhone 3g as well as 2g

 
 

Step:1

First,go and  download IOS 3.1.2 from the links below
For 2g iPhone click here
For 3g iPhone click here 

Step:2

Now open iTunes on your computer. connect your iPhone and Click on restore holding ALT (Mac) and  SHIFT (Windows) at the same time and select the 3.1.2 firmware from you computer. If you get any error during installation download  rec boot and your iPhone will come out from DFU mode
Rec boot for Mac OS here
Reboot for Windows here
Step:3 

Once, the ios starts go to www.blackra1n.com and download and install cydia.
Step:4 

Now after all that we are going to completely reinstall a totally new version of ios 3.1.2. We are going to install a ios that has been edited to work for iPhone using multitasking but not using the standard backgrounder application used on jail-broken phones. So, go to www.whited00r.com and download the firmware for your iPhone. You have two versions to pick from the full version or the lite version. I recommend the full version. iPhone 2g users pick either mms enabled or disabled depends on you.
Step:5
Follow part two of the tutorial again except for rec boot. The iPhone should boot straight up after this. Once it completes set it up as new iPhone and you are done.

Caution:

I am not responsible if any thing goes wrong.Try these at your own risk