[slumpey326]

I want to jailbreak my verizon iphone and currently have 4.2.7 installed. Is there a way to revert back to 4.2.6. Firmware? Anyone successfully able to do this yet.

[iPhoneGleek]

Did you save the blobs? If not then the answer is no.

[slumpey326]

my phone isnt jailbroken, does it need to be jailbroken to save ?blobs?

how do you save blobs?

[Crypton]

You don't need to be jb to save your SHSH blobs. Just use tinyumbrella to do that (either locally or on the Cydia servers).
But if you already upgraded to 4.2.7 you're SOL.

[moneymike47]

I'm sure within the week they'll come out with a 4.2.7 jailbreak, just be patient.

[thunderkeys]

It's possible[1] Apple may still be signing 4.2.6, so try running TinyUmbrella and see if you can save your SHSH.

[1] They're still signing 4.3.1, at least: Twitter / iH8sn0w: @Mleatherb I tried today, ...

[thunderkeys]

Just verified I was able to save mine:

04/17/2011 17:16:00.024 Started saving SHSHs for [bma]
04/17/2011 17:16:01.413 iPhone4CDMA 4.2.6 (8E200) SHSH SUCCESSFULLY saved! [Click Here to Open]
04/17/2011 17:16:01.593 Finished saving SHSHs for [bma]

[maqsur1]

Hi everyone,

Just wanted to share that I was able to downgrade from 4.2.7 to 4.2.6 via itunes (I downloaded the 4.2.6 firmware, and pressed alt-restore in itunes). I then used greenpois0n rc6.1 to jailbreak, and I'm back running cydia etc.

Of note, I did NOT have to save any blobs or whatever. I simply did a restore of the old firmware. Hope that helps.

[Alveezy]

Hi everyone,

Just wanted to share that I was able to downgrade from 4.2.7 to 4.2.6 via itunes (I downloaded the 4.2.6 firmware, and pressed alt-restore in itunes). I then used greenpois0n rc6.1 to jailbreak, and I'm back running cydia etc.

Of note, I did NOT have to save any blobs or whatever. I simply did a restore of the old firmware. Hope that helps.

that's good to hear...i might be restoring my iPhone to just so i can have a fresh start.

[stuge09]

Hi everyone,

Just wanted to share that I was able to downgrade from 4.2.7 to 4.2.6 via itunes (I downloaded the 4.2.6 firmware, and pressed alt-restore in itunes). I then used greenpois0n rc6.1 to jailbreak, and I'm back running cydia etc.

Of note, I did NOT have to save any blobs or whatever. I simply did a restore of the old firmware. Hope that helps.

Sry, im kinda new to this, how did u get 4.2.6 via itunes? Thx.

[Alveezy]

Sry, im kinda new to this, how did u get 4.2.6 via itunes? Thx.

google search "iOS 4.2.6 Firmware" there are so many links. the most commonly used website to get it from is <felixburns.de>.

[stuge09]

i have the firmware already (i think) it is a .ipsw file about 660MB. how do i flash this on my phone? i tried to double click it and that just opens itunes but does nothing else. I went to the site that was mentioned and all i saw was a bunch of links to other sites. Sorry for asking noob questions.

[Snownation]

In iTunes. Click your iPhone, there should be an update button and a restore button.

Shift click restore and point to your ipsw.

Enter DFU mode on the phone first.

[maqsur1]

I have a mac, so in itunes, i hold the alt-button and click on restore. This brings a file dialogue where i can point it to my downloaded firmware.

BTW, I didn't need to be in dfu mode. I simply had the phone connected to itunes, and off it went.

[Rlo05]

Steps to downgrade from 4.2.7 to 4.2.6.

Step 1: Make sure you have your SHSH blobs saved. A way to check this is to download TinyUmbrella, connect your iPhone to your computer, and then once it recognizes your phone, click Save SHSH blobs. It will then verify if you have them saved in the log description.

Step 2: Download the 4.2.6 ipsw file. There are links all over if you just search Google.

Step 3: Open iTunes and put your phone in DFU mode. Then, hold down the shift key and press restore (hold down alt key for Mac users). Then find where you have your firmware saved and select 4.2.6. iTunes will then ask you to press restore.

Step 4: iTunes will restore 4.2.6 on your phone, and here is where you might get the 1013 error, which makes your phone stuck in recovery mode.

Step 5: Download Greenpoison rc6.1. Put your phone back in DFU mode and then run Greenpoison to jailbreak your phone.

After greenpoison does its thing, your phone should boot back up with 4.2.6 installed and you will be jailbroken.

[iRooney]

I can 100% confirm this works. After spending a good three days hunting down a way to jailbreak 4.2.7 I tried the downgrade option. Worked flawlessly.

[Garz]

In iTunes. Click your iPhone, there should be an update button and a restore button.

Shift click restore and point to your ipsw.

Enter DFU mode on the phone first.

DFU mode is not required for a restore

[maqsur1]

Btw is there any compelling reason to save blobs, cause when I downgraded I didnt have to save anything

[Snownation]

You can safely downgrade now because Apple are still signing the firmwares.

Once they stop that, you won't be able to downgrade unless you save your blobs.

[johntkong]

Glad I haven't upgraded to 4.2.7

[slumpey326]

You can safely downgrade now because Apple are still signing the firmwares.

Once they stop that, you won't be able to downgrade unless you save your blobs.

I think they just stopped, I used to be able to download and as of today when I needed to once again, its not working anymore.



I downloaded the appropriate 4.2.6 firmware, held down the home and sleep buttons until the itunes + usb picture appeared on my iphone 4 and then clicked on the appropriate 4.2.6 firmware file that I downloaded previously.

I tried to do the restore, and it got hung up one "verifying restore with Apple", then it errored out, saying, "unknown error occurred, 3194"

This just starting happening today, I have had to restore my iphone 4 a few times in the past few days and it has worked perfectly each time. Did apple or itunes do something so this wont work anymore. Is there a fix?

[Garz]

I think they just stopped, I used to be able to download and as of today when I needed to once again, its not working anymore.



I downloaded the appropriate 4.2.6 firmware, held down the home and sleep buttons until the itunes + usb picture appeared on my iphone 4 and then clicked on the appropriate 4.2.6 firmware file that I downloaded previously.

I tried to do the restore, and it got hung up one "verifying restore with Apple", then it errored out, saying, "unknown error occurred, 3194"

This just starting happening today, I have had to restore my iphone 4 a few times in the past few days and it has worked perfectly each time. Did apple or itunes do something so this wont work anymore. Is there a fix?

Two things that could be. The first Apple stopped signing it as you said. Second, iTunes has been having issues today and that could of caused the unknown error on verifying.

[slumpey326]

hopefully you are correct, will try again later. I even tried on a mac and pc and still had the problem.

I tried these steps also, posted a little earlier in the thread:

Steps to downgrade from 4.2.7 to 4.2.6.

Step 1: Make sure you have your SHSH blobs saved. A way to check this is to download TinyUmbrella, connect your iPhone to your computer, and then once it recognizes your phone, click Save SHSH blobs. It will then verify if you have them saved in the log description.

Step 2: Download the 4.2.6 ipsw file. There are links all over if you just search Google.

Step 3: Open iTunes and put your phone in DFU mode. Then, hold down the shift key and press restore (hold down alt key for Mac users). Then find where you have your firmware saved and select 4.2.6. iTunes will then ask you to press restore.

Step 4: iTunes will restore 4.2.6 on your phone, and here is where you might get the 1013 error, which makes your phone stuck in recovery mode.

Step 5: Download Greenpoison rc6.1. Put your phone back in DFU mode and then run Greenpoison to jailbreak your phone.

After greenpoison does its thing, your phone should boot back up with 4.2.6 installed and you will be jailbroken.

[maqsur1]

As others have mentioned, I no longer can install 4.2.6 on my phone either. So basically, back to 4.2.7. Oh well, no biggie.

[Bitterjay]

Got my iphone today, came in 4.2.6 stock -- upgraded it to 4.2.7 without saving SHSH (didn't know I needed it!), tried to jailbreak it, realized I couldn't because Apple isn't signing 4.2.6 anymore.

Oh well, the jailbreak will be out shortly