How to Downgrade iPhone 3GS Baseband 5.16.02, 5.16.05, 5.15.04 or 5.14.02 to 5.13.04 for Unlocking
Have you searched on many online forums but couldn’t find the right guide to downgrade to 5.13.04 that allows unlocking with ultrasn0w and without breaking your GPS? Then this is the guide for you.
UPDATE: If you have an AT&T iPhone 3GS, unlock it permanently using this.
You’re probably one of the many folks who have not chosen to update to iPad baseband 6.15.00 due to the risks. Do be aware that the following baseband can’t be unlocked with ultrasn0w:
You should have known by now that by updating to iPad baseband 6.15.00, your iPhone can be unlocked but with the following risks:
- This is an iPad baseband which will break your GPS.
- More risks here.
- If you have the new iPhone 3GS 8GB made after week 28 of 2011, you must read this or you will permanently break your iPhone.
Thankfully, the latest version of redsn0w that was just released a few days ago allows you to downgrade from iPad baseband 6.15.00 to 5.13.04. Currently this is the only solution as there’s no way to downgrade directly from a baseband that can’t be unlocked to 5.13.04 e.g. from 5.16.02 to 5.13.04.
You MUST update to iPad baseband 6.15.00 first then downgrade to 5.13.04
Did you read and understand all the risks? OK, let’s proceed.
Apple is still signing iOS 4.1. This means you can still downgrade to an earlier iOS version (iOS usually can’t be downgraded if it’s not being signed by Apple). The reason why you need to downgrade to iOS 4.1 first is so that you can update your baseband to 6.15.00.
[Final warning: Proceed at your own risks!]
1. Backup your contacts, photos, apps etc. Remove your SIM card. (Note: If you made a backup on the latest iOS, you won’t be able to restore it if you’re running on an earlier iOS version.)
4. Download latest version of TinyUmbrella from here.
6. Put your iPhone into DFU mode. See YouTube video here.
7. Launch iTunes, connect your iPhone, hold down the SHIFT for Windows or Option for Mac while you click the RESTORE button in iTunes and select the iOS 4.1 firmware file you have just downloaded. If you get an iTunes error 3194, read here on how to fix it.
8. The restore will end with error 1015 and recovery loop on the iPhone, this can be resolved using the “Exit Recovery” button in TinyUmbrella.
9. Start redsn0w 0.9.6rc18.
10. Browse for the iOS 4.1 firmware you just downloaded.
11. Select ‘Install Cydia’ and ‘Install iPad Baseband’. Warning: installing iPad baseband will break your GPS but by downgrading to 5.13.04 later, will fix it.
12. Follow on screen instructions to put your device into DFU mode to begin the jailbreak.
13. When the process is done, you will find that your iPhone is now jailbroken on iOS 4.1 with iPad baseband 6.15.00. To make sure you can always go back to iOS 4.1, launch Cydia and select ‘Make my life easier.’
15. Launch redsn0w. Go to Extras >Select IPSW button in redsn0w to point to the original firmware you downloaded in Step 2.
16. Do a controlled shutdown of your iPhone (“slide to power off”).
17. Return to the first screen and click ‘Jailbreak’. Check the ‘Downgrade from iPad baseband’ checkbox, uncheck Cydia and click Next.
18. Redsn0w will start doing the downgrade and you will see ‘Flashing Baseband’ screen on your iPhone with the Pawnapple icon. DO NOT INTERRUPT your iPhone while baseband flashing is in progress.
19. When done, your iPhone will reboot itself and you will now have iOS 4.1 with baseband 5.13.04 that can be unlocked with ultrasn0w.
20. You may want to update to iOS 5.1.1 which has untethered jailbreak and can also be unlocked with ultrasn0w 1.2.7. Use this tutorial here (it’s for baseband 6.15.00 but will work for any baseband).
Not too difficult right? If you follow the exact instructions this will work 99%.
Good luck and leave your comments or questions below.
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