Downgrading help!

Sep 25, 2011
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#1
Hey guys. I am in need of some help here regarding trying to restore my GSM iPhone4 from 4.3.5 to 4.3.3 or any other previous version...

I was formerly jailbroken and on iOS 4.1. All was awesome until like 3 days ago when one of my favorite apps (Optimum app) wouldn't run because it said that "I was using an unauthorized Apple iOS"...OK, so I deleted the app, reinstalled and still got the same message. I decided to then upgrade my iOS to 4.2.1 thinking that maybe it would run on that iOS. If not, I would continue to upgrade to newer iOS's until it worked. Subsequently, all hell seemed to break loose on my device. I ultimately had to restore to the newest version 4.3.5 simply because I needed to regain use of my phone function. Since then I have realized how really LAME the iPhone4 is if it is not jailbroken! So, I downloaded redsn0w 0.9.9b1 to jailbreak it again but as all of you know, tethered jailbreaks are such a pain in the a**! So here I am looking for help from all of you who clearly are more adept on these issues than I. If you guys could take a moment and respond with your thoughts, comments or a step by step procedure to follow, that would be totally awesome and greatly appreciated. Additionally, I have no problem meeting anyone in order to resolve these issues I am having and would gladly throw you a few bucks for your services. I am located @ 20 mins outside Manhattan, NY. Thanks again guys!

Here is a little background...

I have:
-all my SHSH blobs saved from 4.1-4.3.5
-downloaded all firmware needed
-made custom firmware via Sn0wbreeze
-changed my host files to every different combination that I have come across via YouTube tutorials.
-disabled firewalls
-running as admin(even though I am on XP)

Every time I try to restore I get some sort of error. Error 3914, 1601, 1602, 20 etc...during the process the screen apparently kicks out of DFU and turns white...

I downloaded tinyumbrella, iReb, RecBoot and everything else I have come across. Obviously I am missing something here. Can anyone help!?
 

Europa

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Dec 12, 2008
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#3
First off, never use sn0wbreeze unless it is absolutely necessary. In this case it's not needed.

Restore to a stock 4.3.3. If you get error 3914, your hosts file is wrong. Fix that and try again. Anticipate a 10xx error when it's done. Use Fix Recovery, not the Exit Recovery or Fix Recovery feature that is built-in to TinyUmbrella. It's a separate program that can be found on the TinyUmbrella website. Then jailbreak with redsn0w.

 
Sep 25, 2011
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#6
Hey Europa. I gave it a go but I am getting a 1601 error everytime I try to restore from 4.3.5 to 4.3.3. Blobs are present in firmware umbrella, I believe the appropriate boxes are checked/unchecked in "advanced tab," firmware is downloaded on my desktop, but during the iTunes restore process my iPhone screen goes white, effectively disconnecting me from firmware umbrella. I downloaded fix recovery like you suggested, extracted the two files(fixrecovery43.exe and fixrecovery421.exe, but when I try to run it it says " This application has failed to start because zlib 1.dll was not found." So basically after this I have to use my redsn0w 0.9.9b1 to "just boot tethered" in order to get my phone to work out of DFU... Any ideas? Perhaps a step by step process that you know of? Thanks again Europa!

PS. I am on baseband 4.10.01
This is the firmware I am trying to downgrade to: iPhone3,1_4.3.3_8J2_Restore.ipsw
This is what my host file looks like:

# For example:
#
# 102.54.94.97 rhino.acme.com # source server
# 38.25.63.10 x.acme.com # x client host
127.0.0.1 localhost
::1 localhost
74.208.105.171 gs.apple.com
74.208.10.249 gs.apple.com
 

Europa

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#7
Don't use TinyUmbrella. Your blobs are also in Cydia so you don't need it. Just shift+restore in iTunes. Your hosts file is correct.
 
Sep 25, 2011
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#8
No dice Europa. Here is what I did...
-I connected my iPhone4 to PC
-Turned it off
-Put it in DFU mode
-Opened iTunes
-Clicked shift+restore
-Selected iPhone3,1_4.3.3_8J2_Restore.ipsw firmware

So iTunes then extracts the software... (status bar fills)
Preparing iPhone for restore (status bar fills)
Then my iPhone seems to get kicked out of DFU and a the iPhone screen turns white
iTunes still displays preparing iPhone for restore (but the status bar is not filling, it is striped like an old barber pole)
After 3-5 mins or so, error 1601 appears

I am at a loss for solutions...Can you help? Thanks!
 

Europa

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#9
Are you restoring to the custom ipsw file you made? If so, restore to the stock ipsw. If not, download the firmware file again.
 
Sep 25, 2011
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#10
Hey Europa. I finally got it right...Downgraded back to 4.3.3 via custom firmware. But alas, another issue. I am unable to make calls now. My signal bar shows either 1 bar or no service. I toggle Airplane mode...no good. I reset network settings...no good. I even got a new SIM card...no good! I am on 4.3.3 on BB 4.10.01. I am an AT&T customer w/a legit SIM card. The dude at AT&T told me to go to Apple. Any thoughts? Thanks!
 

Europa

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Dec 12, 2008
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#11
How is your signal when you disable 3G and let it run on Edge?
 

AeroCare

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#12
Is Cydia still storing SHSH? I'm thinking about buying an AT&T iPhone 4 on craigslist but he already upgraded to ios5 and 4.11.08.

I read that you can restore to 4.3.5 and 4.10.01 then just update with out updating the modem. This way I can JB tethered on ios5 and hopefully get an unlock soon or just use GEVEY. Am I correct up to now?

By the way it has AppleCare so I'm thinking push come to shove I accidentally brick it and go get a brand new one (do I have to pay the $50 deductible?) and sell it to someone who likes AT&T.
 

AeroCare

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#13
Now I read that Apple is still signing 4.3.5. If this is true then I won't need Cydia, can I just download a factory 4.3.5 ipsw and restore to that version and if so the most important part, will that bring back my modem baseband back to 4.10.01?