Update 3: If you have iPhone first gen or iPhone 3G (not iPod Touch) you can use iphodroid. This eliminates the need for Ubuntu and the process is VERY quick. Tutorial Here:
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Update 2: I have a tutorial up on how to install backup manager here: [ Register or Signin to view external links. ]

UPDATE 1: Back up manager support confirmed check this out once you finish the tutorial - [ Register or Signin to view external links. ]
You use the zImage from the iPod Touch 1G link on the site above and the android.img.gz from iPhone 3G link.

For this you WILL need:
Ipod Touch 1G, iPhone First Gen, or iPhone 3G on 3.1.2, 4.0.0, 4.0.1, or 4.0.2 firmware Jailbroken with BLACKRA1N or Redsn0w. Sorry no spirit.
- Learn to Downgrade Here - [ Register or Signin to view external links. ]
- Once you downgrade you need to jailbreak again using blackra1n or Redsn0w
- Download blackRa1n Here - [ Register or Signin to view external links. ] .
- If you need 3.1.2 firmware for Ipod Touch First Gen Download here -
- When you try to run blackra1n you may get an error about ASL.dll missing. If so you can fix that here - [ Register or Signin to view external links. ] .

Vmware Player - [ Register or Signin to view external links. ] .
Ubuntu 10.04 - [ Register or Signin to view external links. ] .
Openiboot - [ Register or Signin to view external links. ]
PS3freedom IPT1G - [ Register or Signin to view external links. ] .
Winscp - [ Register or Signin to view external links. ]
OpenSSH - Search OpenSSH in cydia on your ipod and install.

Lets Get Started

- Install Vmware Player and create a virtual machine with the Ubuntu 10.04
Desktop you downloaded. Or if you have Ubuntu installed on a computer, that also works.
- Get OpenSSH installed on your ipod.
- Start up VMware with Ubuntu
- Download openiboot from the link above and put it on the desktop of Ubuntu
- Open the rar file and extract the files. Drag the openiboot folder to your home folder in Ubuntu
- In the home folder open openiboot folder and find "loadibec" and "oibc" and right click. Go to permissions and set each of them to read write on all options and also check the box that allows them to be executed
- Open terminal from applications - accessories
- In the terminal type "cd ~/openiboot" without the quotes. press enter
- Now type "sudo su" press enter. Enter your password that you setup while setting up VM
- Next put your ipod in recovery mode. - Step 1. Turn off your iPhone. - Step 2. Hold down the power and home button. - Step 3. When you see the Apple logo, release the power button but continue holding the home button down. - Step 4. Open iTunes and wait for it to tell you that its in restore mode.
- In terminal type "./loadibec openiboot.img3" you should see openiboot show up on your ipod's screen. If not you need to make sure you set the permissions for the files in the openiboot folder correctly in the step earlier. Also, you need to make sure you are on 3.1.2 JB with blackra1n
- On iPod touch press the power button once and you will see console highlighted on ipod screen.
- Now in terminal on Ubuntu go ahead and type "./oibc" but do not press enter yet
- On ipod press home button. You will see it boot into a terminal and display some text. As soon as you see that press enter on the keyboard on Ubuntu. You should then see the same text in the terminal window as you see on ipod. - If you do not see the text and just see some dots at the bottom of the terminal that means your timing was off.
- Press and hold home and power on the ipod until it restarts. Put it in recoevery mode and start over
- Once the commands quit scrolling by in the terminal you should see welcome to openiboot at the bottom. At this time type "install" in the terminal and press enter
- It will start installing openiboot on the ipod. This will take a few minutes. It will say finished when it is done
- Once it is finished disconnect your ipod from the computer and you can close Ubuntu, you are done with it for good.
- Press and hold power and home on the ipod. You will end up back at the openiboot screen.
- Just presss the home button as iphone os will already be selected and this will start your ipod like normal.
- Now on your PC extract the ipt1g folder from the psfreedom rar file.
- connect winscp to your ipod in scp mode. Username is "root" Pass is "alpine"
- Make sure you are in \system\private\var
- click and drag the "android.img.gz" and "zimage" files over to the win scp window. Make sure you do not drag it into any of the folders in var, just in var. You may need to streach the winscp window to expose some blank space to drag the files to.
- Now right click on each of the files and set the permissions to 777 and click ok
- Done, now USE IT!

Disclaimer- I take no credit for this, im also not responsible for anything that happens to you, your ipod, your ps3 or anything else you used to do this..