You cannot use JailBreakMe method to jailbreak and unlock iOS 4.0.2 on iPhone 3G. However you can still jailbreak and unlock iPhone 3G using redsn0w. Here are the instructions:
Download the latest RedSn0w 0.9.5-b5 in our utilities page here .
Download firmware images for iOS 4.0 here .
Run RedSn0w and point it at the 4.0 IPSW. (Yes – point it at the 4.0 IPSW even though you’re at 4.0.2). This will also hacktivate your iPhone3G at 4.0.1 if you haven’t already been activated by iTunes.
If you need a carrier unlock – install ultrasn0w in Cydia (add repository http://repo666.ultrasn0w.com). For T-Mobile in the USA remember to turn off 3G mode in Settings→General→Network.
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Great news for all iPhone 3GS users. DevTeam updated ultrasn0w , software that unlocks iPhone with firmware 3.0. Now it supports iPhone 3GS!
Avaliable in Cydia , repo: repo666.ultrasn0w.com
Here are quick instructions:
Ensure you have firmware 3.0
Jailbreak your iPhone using redsn0w (this will also install Cydia)
Run Cydia
Please add the repo repo666.ultrasn0w.com to Cydia. That last “o” is actually the number zero “0”! If you use the letter “o” you’ll get an error.
Search for ‘ultrasn0w’ in cydia or icy and install ultrasn0w
Reboot your iPhone 3G
T-Mobile USA users should disable 3G before using ultrasn0w
Enjoy
If you have any problems reset your network settings (it helped many users): Settings->General->Reset->Reset Network Settings
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DevTeam released Ultrasn0w – application that will unlock your iPhone 3G with firmware 3.0. Here are the instructions:
Ensure you have upgraded to iPhone OS 3.0
Jailbreak your iPhone using redsn0w (this will also install Cydia )
Run Cydia
Please add the repo repo666.ultrasn0w.com to Cydia. That last “o” is actually the number zero “0”! If you use the letter “o” you’ll get an error.
Search for ‘ultrasn0w’ in cydia or icy and install ultrasn0w
Reboot your iPhone 3G
T-Mobile USA users should disable 3G before using ultrasn0w
Enjoy
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