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I have an iPhone 3GS (old bootrom) and updated to 4.2.1 via iTunes a few days ago. Then I jailbreaked it via redsn0w 0.9.6b6. I only marked the option to install Cydia, nothing else (i.e. I didn't updated the baseband to 6.15.00; in settings on the iPhone, it says I have 5.15.04).

Now, it seems that GPS is not working anymore. Why? How can I fix it?

If there is not really a way to fix it, what are the options? In any case, I must have GPS working and I must have the jailbreak.

Downgrade to 4.2 somehow? Or reset it somehow?

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You'll need a copy of your old SHSH blobs. If you don't have it, I don't believe you will be able to downgrade.

If you have your old blobs, grab a copy of the older firmware and follow various guides

  • if you have the copy @Albert, this is the guide: thebigboss.org/jailbreak-now – cregox Jan 14 '11 at 2:53
  • @Cawas - that link doesn't answer his question on how to downgrade or fix his GPS issue. – Rex Jan 14 '11 at 15:20
  • I meant to jailbreak, so he know which best version to downgrade to. – cregox Jan 14 '11 at 16:15

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