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First, You must jailbreak with redsn0w (easiest)
Then, Open cydia and search "bootlace"
Install it, then open it
Install Openiboot in bootlace, then install idroid
SSH into your iphone, go to /private/var/idroid
If there isn't an idroid folder, make one
Download this:
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And this:
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And, either one of these, depending on your iDevice
iPhone 2G:
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iPhone 3G:
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To downgrade, Put the files from the service_jig folder in /private/var/idroid
Then, put the following files from the iphodroid/iphodroid_image folder in your idroid folder: cache.img, system.img, and userdata.img
Now shut off your iphone, and prepare to downgrade!
Plug your iphone in to your ps3, make sure its off.
Now boot up android with openiboot
When the words turn grey, press the power button followed by the eject button over and over again (works better that way for me

)
Check to see if your ps3 is in factory service mode, if so move on to the next step
Unrar the DGF.rar and format any usb stick to FAT32
Copy the LV2diag.self FILE 1 and the modded 3.41 PUP to your usb stick
Put the usb stick in the right-most usb slot on your ps3 (make sure your ps3 is off)
Turn on the ps3, and wait for it to turn off (it should be just a black screen)
When it turns off, delete the files off of your usb and put the LV2diag.self FILE 2 on it
Plug it in the right most usb slot again, turn the ps3 on, and wait for it to turn off
Now, SSH ****ALL**** of the files from the iPhoDroid_image folder to your /private/var/idroid
Do the jailbreak, and you're done!!!