It doesn't need to be jailbroken or anything. Co-worker's husband upgraded and now, obviously, finds his phone to be even slower. A link will be fine.
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How do you downgrade a 3G from iOS4 to 3.13?
- Thread starter darngooddesign
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Thanks, didn't know if there was a lock against downgrading OSes, like apple not signing OSes prior to 3.13. On an aside, can you downgrade a 3GS from 4 to 3 the same way?
Do you have to use recboot or can I just hard reboot (home + power) ?
Do you have to use recboot or can I just hard reboot (home + power) ?
you have to use recboot or firmware umbrella or irecover or something like that. it will not boot because 3.1.3 expects there to be an older modem firmware. you have to tell it not to care.
The real problem is that the downgrade technically "fails" at the last step because it is unable to upgrade the baseband -- since you already have a newer version. As a result, it does not change a flag in the bootloader configuration that allows it to boot normally, rather than back into recovery mode.
Fortunately, by the time you get this failure, the phone has already been completely restored. All these programs do is change the bootflag to allow you to boot the OS. It's harmless.
Fortunately, by the time you get this failure, the phone has already been completely restored. All these programs do is change the bootflag to allow you to boot the OS. It's harmless.
Thanks. I was looking for the actual reason for needing iRecovery (or similar). You explained it well.
I am going to upgrade a 3G (3.13) to 4.0 (I know, I know) for a specific bluetooth function that I need for a specific set of BT headphones. The fallback seems to be pretty much foolproof so I'm going to try it. I bet you don't get your app specific data back though. I have to search some more on that.
Thanks again.
This worked perfectly for me
http://www.maclife.com/article/howtos/how_downgrade_your_iphone_3g_ios_313
http://www.maclife.com/article/howtos/how_downgrade_your_iphone_3g_ios_313