If you do it in this order, you should get no errors, and be able to boot tethered to a jailbroken state or untethered to an IT Safe-Mode-like state until you have time to boot tethered. If you use the last option, I recommend updating to iOS 5 clean, then Jailbreak tethered, then install AppSync for 5+, then use itunes to restore from backup to get all your info and data back on the phone, then install the SemiTether tweak. I hope this helps you find the best path to get your device back to a somewhat agreeable state. This tweak just came out yesterday, so it is in its infancy still. This will give you iOS 5 Jailbroken that will allow you to boot to an IT Safe-Mode-like state without booting tethered until you can get to a PC to use the same Redsn0w to boot tethered. Your best option at this point is to stay with iOS 5, use the tethered Redsn0w 0.9.9b7 jailbreak tool, then install the SemiTether tweak from BigBoss (Repo address ). You'll have to do your own research on that. The one caveat to this is that you will have to use custom IPSW files to restore from now on, and you will have to rely on "Hacktivation," which I am not sure will work with CDMA iPhones yet. The only option you MIGHT, MIGHT, MIGHT have is to use Redsn0w to update to the iPad bb, and restore using a custom Sn0wbreeze IPSW using a pre-10.5 version of iTunes. ![]() You have just learned a very important lesson about basebands and how apple has many ways, not just SHSH files, to ensure that you don't try to cheat old firmware versions. Once the bb was restored to iOS 4, and the firmware was restored to 4.2.10, I was able to create a custom signed IPSW file using iFaith and my SHSH to downgrade to 4.2.8 without activation errors. This way I was able to use a clean restore from apple to get it back down to 4.2.10 and iOS 4 bb. ![]() I did the same thing you did, but I was lucky enough to do it while apple was still signing 4.2.10, prior to public release of 5. Since you did a clean restore from apple, allowing them to update your bb, you will no longer be able to downgrade, (for now) even with saved SHSH's. If you had created a custom IPSW file using the "preserve baseband" option, and upgraded to iOS 5 using it, you would still be on the old bb in iOS 5. Before iOS 5 was released to the public, you could have downgraded back to 4.2.10 to get back the iOS 4 baseband then downgraded to 4.2.8 using iFaith, but now it is too late as apple is no longer signing the old 4.2.10 iOS (SHSH). The reason iTunes cannot activate 4.2.8 is because you are trying to use the iOS 5 baseband (modem firmware), which was upgraded when you restored to iOS 5.
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