How to Downgrade Your iPhone 3GS, 3G Baseband for Unlock (Windows)

Apurva - May 10, 2015 at 4:58am

I am on activation screen of 6.1.6 with baseband 6.15.00. The problem with these steps is that my power button doesn't work and so I created a custom IPSW of 5.1.1 as specified in https://www.iclarified.com/entry/index.php?enid=23009 for putting the phone in DFU mode. Will I be able to use that ipsw to put the phone in DFU mode and downgrade it as specified in this tutorial?

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Zareef Hasan - March 11, 2015 at 10:03pm

You can downgrade only if you have baseband version 06.15.00 (NOT 06.15.05 or like that). If you don't have that you have to first jailbreak with "Install iPad baseband" from redsn0w to get exactly 06.15.00. Then you can jailbreak with "Downgrade from iPad baseband" and then it will work! :)

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EzequieL - October 24, 2014 at 2:12am

THANK YOU SIR! ITS WORK I WAS DOWNGRADE MY MODE FIRMWARE 6.15.0 TO 5.14 Thank you!

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Biswajit Tripathy - August 16, 2014 at 10:14am

Whatever I do I am unable to downgrade the baseband for my iPhone 3GS running iOS 5.1.1 from 6.15.00. Have tried all steps on all forums. Its been 4 days I have been trying continuously....

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Doc132 - August 2, 2014 at 8:32pm

for ios 6.1.6 you must use the ios 6.0 ipsw to get redsnow to read the ipsw. this worked for me hope it works for someone else !!

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yunusemre - June 27, 2014 at 11:11am

me too gjg erroe

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gjg - June 28, 2014 at 2:20am

i did a full restore

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gjg - June 26, 2014 at 3:29am

Help pls... Error! Please reboot the device into normal operating mode, then perform a clean "slide to power off-