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Can I restore iPhone 4 to firmware of my choice?

N

NJRonbo

macrumors 68040
Original poster
Jan 10, 2007
3,278
1,316
I have a jailbroken iPhone 4 on firmware 4.2.1

It's acting whacky today after a Cydia update.
Cannot find the cause despite installing and uninstalling
Cydia apps.

Looks like I may have to reset the iPhone and rejailbreak.

Thing is, I don't want to upgrade from 4.2.1

Big reason is, tethering. AT&T seems to have tougher
time snooping around with people who have 4.2.1

Whether that is true or not....

Can I simply download a 4.2.1 IPSW file and in iTunes
have it update that firmware rather than the newest one?

If that can be done, can someone take a moment and
post step-by-step instructions to doing it including the
specific right-click iTunes command to manually update
the phone?

Again, I want to reset iPhone and have it install iOS 4.2.1

Hopefully it can be done. Then I can rejailbreak with GreenPoison.
 
No you can't - unless you have your SHSH saved for the particular firmware. If you don't understand this, just look through the threads or search for SHSH and you'll see why.
 
If he is jb on 4.2.1, isn't it safe to assume cydia has saved shsh for 4.2.1? Or did I just assume and make an a...
 
It's likely, but considering the OP's seeming inability to use google or the search function, there's a possibility the blob wasn't saved.

svenn said:
If he is jb on 4.2.1, isn't it safe to assume cydia has saved shsh for 4.2.1? Or did I just assume and make an a...
Click to expand...
 
Love the way some people just go after others
trying to learn this stuff.

Sorry. It's easier for me to ask.

I do have iOS 4.2.1 listed at the top of Cydia.

I will do a search and try to come up with the
answer on my own, but in the meantime, if
someone would be kind enough to explain how
I can restore my iPhone to 4.2.1 I would be very,
very appreciative.
 
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