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Go Back   GSM-Forum > GSM & CDMA Phones / Tablets Software & Hardware Area > iPhone ,iPod & iPad (Apple Inc. Products) > iPhone 4 / iPhone 4S

iPhone 4 / iPhone 4S iPhone 4 / 4S

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Old 03-09-2012, 19:05   #1 (permalink)
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How to Upgrade Your iPhone to iOS 5.1 Without Updating Your Baseband


These are instructions on how to upgrade your iPhone 4 GSM or iPhone 3GS to iOS 5.1 without updating your baseband using Windows.

Step One
Download the latest version of RedSn0w from here and place it in a Pwnage folder on your Desktop.



Step Two
Download the iOS 5.1 firmware for your device and place it in the same Pwnage folder.



Step Three
Extract the RedSn0w archive then right click the RedSn0w executable (from within the extracted folder) and select Run as Administrator to launch the application.





Step Four
Click Extras from the RedSn0w main menu.



Step Five
Click Custom IPSW from the Extras menu.



Step Six
Select your iOS 5.1 firmware from the Pwnage folder on your Desktop and click Open.



Step Seven
RedSn0w will now customize an IPSW file for you.



Step Eight
RedSn0w will inform you once your IPSW has been created successfully. Click the OK button.


Last edited by J@zz; 03-09-2012 at 19:13.
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Old 03-09-2012, 19:12   #2 (permalink)
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Step Nine
Click Pwned DFU from the Extras menu.



Step Ten
Connect your device to the computer via USB and power it off. Then click the Next button to continue.



Step Eleven
Hold down the Power button for 3 seconds.



Step Twelve
Without releasing the Power button, also hold down the Home button for 10 seconds.



Step Thirt een
Without releasing the Home button, release the Power button BUT KEEP holding the Home button until your device is detect in DFU mode.



Step Fourt een
You device will now be exploited with LimeRa1n.



Step Fift een
Once its done you will be in Pwned DFU mode.



Step Sixt een
Launch iTunes by clicking its icon in the dock.


Step Sevent een
Select your device from the list on the left, then hold down the Shift key and click Restore.



Step Eight een
Select the NO_BB custom IPSW from the Pwnage folder on your desktop and click Open.



Step Ninet een
You iPhone will now be upgraded to iOS 5.1 without updating the baseband.
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Old 03-09-2012, 19:43   #3 (permalink)
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Can you please upload the custom 5.1 for iphone4 and post link? I tried to create one with the latest Redsnow but I keep getting "Memory Exhausted" error.
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Old 03-09-2012, 20:01   #4 (permalink)
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Nice tutorial, that will help many noobs
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Old 03-09-2012, 21:12   #5 (permalink)
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can i still do this even if i have just jailbroke my phone ? ie can i just do a jailbreak again but do all of this so i can unlock the network.?
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