How to Downgrade iPad Baseband 06.15.00 on 3G/3GS to 05.13.04 or Earlier (GPS Fix)

(Last Updated On: June 19, 2020)

Wow, it’s been a long wait. When the unlock for iPhone 3G and 3GS came out in November 2010 using the iPad baseband 6.15.00, many didn’t expect it would break the GPS. The fix is here, finally.

MuscleNerd had been tweeting over the past few weeks about this fix and he successfully downgraded a 3GS with iPad baseband 06.15.00 to an earlier baseband. As I’ve predicted it’s made available via redsn0w and it fixes a whole range of issues associated with the iPad baseband.

Ready to fix yours? See the instructions below.

1. Download the latest redsn0w from the iPhone Dev Team’s website.

2. Launch redsn0w.

3. Plugin iPhone. Put into DFU mode.

4. Go back to the first screen and click “Jailbreak”.  Check “Downgrade from iPad baseband”, uncheck Cydia if you already installed it, and click Next. Just wait until you see the “Flashing Baseband” screen.

It takes a while to finish it so don’t unplug or do anything to your iPhone! Your iPhone will reboot itself once it’s done!

 That’s it guys! You should have a working GPS now. A few things to note:

1. Always preserve your baseband when updating to the latest iOS (except if you’re now officially unlocked by your carrier).

2. Avoid flashing/reflashing your baseband if possible because this is extremely risky!

3. If you have a 3GS made after week 28 of 2011, do not attempt to update to 6.15.00 in hope to downgrade to 5.13.04! You will brick your iPhone!

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