RedSn0w Update Improves iPhone 3GS Baseband Downgrade, Adds DFU IPSW Feature

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Posted July 5, 2012 at 3:23am by iClarified

The iPhone Dev-Team has updated RedSn0w with an improved iPhone 3GS baseband downgrade method and a niche 'DFU IPSW' feature.

This version covers 3 different types of NOR chips in the iPhone 3G and 3GS (the earlier version covered only the most prevalent NOR chip). We've also simplified the process and added logging to help diagnose any remaining stubborn iPhones.

The revised steps are:
● Connect your iPhone in normal mode, then click "Jailbreak" after redsn0w identifies its model and BB version (you needn't pre-select the IPSW anymore).
● Choose the "Downgrade from iPad baseband" option (you needn't worry about de-selecting Cydia anymore).
● Do a controlled "slide to power off" shutdown of your phone and proceed through the normal DFU ramdisk steps.

If the downgrade fails the iPhone Dev-Team suggests posting your redsn0w log at the link below.

Use the "Extras->Even more->Backup" button to grab a copy of /var/mobile/Media/redsn0w_logs, then extract the log text file(s) from the zip and paste them into the comments (currently that log file is generated only during baseband downgrade runs).

Warning:
3GS units manufactured in early 2011 or later have a NOR chip that's incompatible with 06.15.00 and so trying to install it will brick the device!

NEW DFU IPSW FEATURE
This feature is for users with a broken home or power button. It lets you enter DFU mode as long as your device is healthy enough to restore to a normal stock IPSW.

In redsn0w, go to "Extras->Even More>DFU IPSW" and select an IPSW that is currently being signed for your device and that you'd normally be able to restore to without any hacks. redsn0w will create an "ENTER_DFU_" version of the IPSW that you can restore to just like any other IPSW, except that now you'll be dumped into DFU mode towards the end of the restore (WARNING, your screen will remain completely black…the only way to even know its own is that iTunes and redsn0w will detect it!).

You can download the new 0.9.14b2 version of RedSn0w from here. You can find instructions on how to perform the baseband downgrade here: Windows, Mac.

RedSn0w Update Improves iPhone 3GS Baseband Downgrade, Adds DFU IPSW Feature

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S - October 20, 2012 at 2:27am

Fri Oct 19 17:49:59 2012 Stashing /mnt/Library/Ringtones Fri Oct 19 17:50:02 2012 Stashing /mnt/Library/Wallpaper Fri Oct 19 17:50:07 2012 Linking /mnt/usr/include Fri Oct 19 17:50:07 2012 Linking /mnt/usr/lib/pam Fri Oct 19 17:50:07 2012 Stashing /mnt/usr/libexec Fri Oct 19 17:50:11 2012 Stashing /mnt/usr/share Fri Oct 19 17:48:47 2012 Stashing /mnt/Applications Fri Oct 19 17:49:59 2012 Stashing /mnt/Library/Ringtones Fri Oct 19 17:50:02 2012 Stashing /mnt/Library/Wallpaper Fri Oct 19 17:50:07 2012 Linking /mnt/usr/include Fri Oct 19 17:50:07 2012 Linking /mnt/usr/lib/pam Fri Oct 19 17:50:07 2012 Stashing /mnt/usr/libexec Fri Oct 19 17:50:11 2012 Stashing /mnt/usr/share Fri Oct 19 17:48:47 2012 Stashing /mnt/Applications Fri Oct 19 17:49:59 2012 Stashing /mnt/Library/Ringtones Fri Oct 19 17:50:02 2012 Stashing /mnt/Library/Wallpaper Fri Oct 19 17:50:07 2012 Linking /mnt/usr/include Fri Oct 19 17:50:07 2012 Linking /mnt/usr/lib/pam Fri Oct 19 17:50:07 2012 Stashing /mnt/usr/libexec Fri Oct 19 17:50:11 2012 Stashing /mnt/usr/share

Reply · Like

Clayton - October 9, 2012 at 4:57am

I'm pretty stumped trying to downgrade my baseband from 6.15. I keep getting an Exploit Failed message after the second stage is uploaded. One strange thing I've noticed is that on my iPhone it lists the modem firmware as 06.15.00, but in Redsn0w it displays "iPhone 3GS (5.0.1, 05.16.05)". Why wouldn't it recognize my correct firmware? I'm trying to get my phone back to stock since AT&T has now approved my unlock. I've tried many variations (like not letting go of the home button when entering dfu, or not selecting an ipsw) but can never get past this Exploit Failed message. Anyone able to offer any suggestions?

Kjohnso - September 19, 2012 at 6:21am

my SN is **021****** is it safe to unlock?

Vladas - July 27, 2012 at 2:48pm

Fri Jul 27 17:20:50 2012 Stashing /mnt/Applications Fri Jul 27 17:22:36 2012 Stashing /mnt/Library/Ringtones Fri Jul 27 17:22:37 2012 Stashing /mnt/Library/Wallpaper Fri Jul 27 17:22:39 2012 Linking /mnt/usr/include Fri Jul 27 17:22:39 2012 Linking /mnt/usr/lib/pam Fri Jul 27 17:22:39 2012 Stashing /mnt/usr/libexec Fri Jul 27 17:22:43 2012 Stashing /mnt/usr/share Downgrade fails

Lloyds - July 9, 2012 at 12:28pm

Cheers guys,worked a treat first time,bit of a heart stopping moment but success with compass and location services.the only thing left to get fix for is the missing antenna filter components on many iPhones out there,I've tried the wire bridge but it's not as good as the real thing.any help would be appreciated. Cheers!!...

realms - July 7, 2012 at 4:17am

Thank You It was worth the wait .

Mohan - July 6, 2012 at 1:40pm

I am having a factory unlocked iPhone, which a friend updated to iPad baseband..I m currently on FW 5.1.1, I can see the Home screen, but no Wifi, no Bluetooth, but IMEI is present, even it does not recognize the SIM card, unable to downgrade.. Please help

Still waiting for Iphone 4 unlocked - July 6, 2012 at 1:07pm

It work perfectly on my old 3G and 3GS 5.1.1 Thanks a bunch this is freakin great.....

Johan - July 5, 2012 at 6:13pm

Thank god! It worked for me and I had really given up hope for my phone.

Jeff - July 5, 2012 at 1:36pm

Did not work for me!

Thang Tran - July 5, 2012 at 10:14am

This time it worked with no error. Many thanks to MuscleNerd, the Dev-Team and iC.

Phidol - July 5, 2012 at 6:43am

YESSSS!!! SUCCESSS!!! only at one run and my phones baseband was downgraded... now to check it with a gps app... big thanks to MuscleNerd and the Dev-Team!!!

Miyuru - July 5, 2012 at 6:27am

This works... But ultrasn0w doesn't work..still invalid sim,no service etc...

Tario70 - July 5, 2012 at 6:29am

I've been told you need to reinstall mobile substrate & ultrasn0w after the downgrade. Have you tried that?

Miyuru - July 5, 2012 at 6:37am

Thanks a lot... It worked like a charm... U and dev team made my day... Thanks a lot...

bobbyjonc - July 5, 2012 at 5:13am

The power button of my iPhone 3GS is non-functional and this updated downgrade is a good news for me. However, I am stucked on iOS 4.2.1. Is it possible for me to upgrade to iOS 5.1.1 without the usual "Power Off" procedure (holding down the Power button)?

Garfield - July 5, 2012 at 6:30pm

Testeando By Garfield"

DNA64 - July 5, 2012 at 8:48pm

Yes there are ways to get around broken power and home buttons, but might I suggest fixing your power button to make life simpler. It should only cost you around $30 If you're too cheap/broke just deliberately corrupt LLB and it will boot into dfu, then use redsn0w to enter pwnd dfu mode and load a custom 5.1.1 ipsw. If you don't need the unlock you could always just use iTunes to update.

DNA64 - July 5, 2012 at 8:57pm

You could also just try the NEW DFU IPSW FEATURE if you have an older 3GS device (Settings > General > About: Serial Number **133****** or Lower.) Some users have reported **134****** as being safe, but flash at your own risk. **135****** and above WILL brick your iPhone, and AFIK nobody has been able to repair these. Once you have restored to a stock 5.1.1 ipsw you can then use redsn0w to flash the iPad baseband, and then downgrade the iPad Baseband. Why Redsn0w doesn't have a 1 click option to do this (Update basebands to 06.15.00 then downgrade to ultrasn0w compatible) is a question I'll have to ask MuscleNerd, pod2g or another one of the guys. But maybe it has to do with the way the Downgrade process works.

bobbyjonc - July 6, 2012 at 1:23pm

Thank you for the information. I'm not really keen on doing all these jailbreaking procedures. The first and last time I did this was on my iPod Touch 2nd generation with the simple swipe-to-jailbreak procedure of JailbreakMe. This iPhone 3GS (from AT&T) was jailbroken and unlocked by my buddy. Thanks to him, I'm able to use it here in the Philippines. Surprisingly, the Power button is now functioning, however I have to press it a little harder for it to work. I don't have plans of having it fixed/replaced since I'm waiting for the next generation iPhone. I'll dispose this by then.