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12-04-2010, 08:52 PM #1Want to update 3G from 4.0.2 to 4.2.1 and preserve unlock
I'm looking around trying to find the best set of instructions, but I'm not really sure I have the whole picture.
I have a 3G running 4.0.2 w/ modem firmware 05.13.04. It is currently jailbroken (using limera1n) and unlocked, but it is so laggy that it is painful to use. I've heard that 4.1 was a bit better and 4.2.1 is even better still. Can someone point me to decent directions on how to upgrade to 4.2.1 and preserve my unlock? I really can't afford to lose my phone for a while, so I'm trying to research it as much as I can before moving forward.
Thank you in advance.
12-04-2010, 09:09 PM #2
12-04-2010, 11:29 PM #3
I'm running Windows.
12-04-2010, 11:31 PM #4
12-04-2010, 11:34 PM #5
Consider disabling multitask and wallpaper. It'll run much better that way, including going to 4.2.1, although the upgrade itself should improve performance.
12-05-2010, 06:31 PM #6
Since I saw the mediocre performance, I avoided multitasking and any other customization.
4.x is so horrible on the 3G. Hopefully 4.2.1 makes enough of a difference that the phone is usable again.
05-23-2011, 09:05 AM #7
Can someone please help me!! I got this iPhone 3G second hand:
What is the best way to jailbreak & unlock this at the latest firmware available? I'm running Windows and I've got an iPhone 4 4.2.1 jailbroken too, but that was a lot easier so I'm not entirely a JB-noob :P
Thanks in advance,
05-23-2011, 11:00 AM #8
Use snowbreeze to make a custom 4.2.1 firmware and restore to that. That will preinstall cydia for you so that you only have to install ultrasnow after to unlock. Do not restore to a regular 4.1 or 4.2.1 or you will lose the ability to unlock.
05-24-2011, 11:41 AM #9
05-24-2011, 11:45 AM #10
05-24-2011, 11:55 AM #11
But I would've hated myself if it were my iPhone, since I use GPS all the time and even on Navigon 1.8.1. Anyways thanks for the info, next time I'll dig even deeper and ask questions first, then jailbreak/unlock!!
05-24-2011, 12:00 PM #12
05-24-2011, 12:17 PM #13
That's a bummer. Just broke the GPS and lost a good unlockable baseband. You could check to see if Fuzzyband in Cydia will downgrade the baseband, if I am remembering correctly, someone with a 3G downgraded his baseband from 6.15.00 with Fuzzyband because he had bootloader 5.08. But if not then that baseband upgrade is permanent.
Ideally if this isn't your device, if I were you I would try to downgrade the baseband for that someone you did this unlock for. If it isn't possible because the bootloader isn't 5.08 then at least you've tried