UPDATE: This method WILL work for iPhone 4
RESTORING to 4.3
This page ONLY deals
with iPhone 4 baseband protection. I'm sorry this will not work for any other
device.
You
can protect your iPhone 4 BB restoring to iOS 4.2.1. Follow these
steps exactly:
Get
the latest TinyUmbrella.
Get
the latest greenpois0n rc5 update (http://greenpois0n.com)
Open
TinyUmbrella
Plug
in your device and save SHSH (make sure 4.2.1 SHSH were saved, if not don't
bother continuing)
Start
TSS Server (If you get errors read the help section or FAQs or comment below
typically it fails because you have some kind of web sharing enabled... use
google to fix it - your issue really not much I can do...)
Open
iTunes
Select
your device in iTunes
Shift(windows)
/ Option(Mac) restore -> Select the 4.2.1 ipsw
Restore
SHOULD error with a 1013 error. Click the "ok's" and close iTunes.
With
your device sitting with the usb pointing to iTunes (recovery mode), enter DFU
by pressing and holding HOME + POWER until your screen goes black... then after
a count of 2 (1.5-2 seconds) let go of POWER but keep holding HOME. If all goes
well you will see nothing but a black screen. If your timing is even a LITTLE
bit off, you will see the apple logo and your phone will boot back into
recovery mode... Go back to step 10 and try again.
You're
now in DFU mode. Start greenpois0n and press 'Jailbreak'
Once
greenpois0n has finished its thing. Press 'Complete!'
Let
your device restart. You should end up on the activation screen.
Congrats
your baseband was preserved and you are now on 4.2.1
Put
your device into DFU mode and then click 'Fix Recovery'
Click
'Yes'
Your
device's screen will turn white and you'll see debug boot information.
Eventually
your device will boot into the activation screen.
Congrats.
You're on 4.2.1 (again)? :)
If
you get a 16XX error then try entering DFU and go to step 5.
If
your restore does NOT end in a 1013, it means your baseband was updated. This
is likely because you did not have the TSS server running OR you updated without
TinyUmbrella OR you are working with a device OTHER than iPhone 4.
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