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Re: My iphone 3g ios 4.2.1 wont go into dfu mode
I find that you have to just keep trying the following sequences to get it to DFU mode
connect the iphone to your pc/mac
turn it off
press and hold the power button for 10 sec
get ready to press the home button while holding the power button
press the home button while holding the power for 10 sec's
let go the power button and hold the home button for 10 seconds.
if it still doesn't go to DFU keep repeating the above steps until it does.
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This will guide you on using greenpois0n RC6.1 to jailbreak your iDevice with iOS 4.2.1:
iPod touch 4G
iPod touch 3G
The jailbreak will be untethered, meaning you don't have to worry about rebooting your iDevice. WARNING!: This is NOT recommended for iPhone 3G. WARNING!: This will NOT guide you on unlocking the iPhone. If you're looking for unlock, CLICK HERE.
You will only need greenpois0n RC6.1 for this jailbreak. Download links below:
Update iTunes to 10.2.1 for best results. Procedure:
Plug your iDevice to your computer
Open iTunes & prepare to put your iDevice to DFU mode
DFU Mode: Press and hold both POWER and HOME buttons for EXACTLY 10 seconds
DFU Mode: Release the POWER button but keep holding the HOME button for another 15 to 20 seconds
You can release the HOME button once your computer beeps like a USB device has been connected OR once iTunes alerts you that it has detected an iDevice in recovery mode, which looks like this:Click on image to view larger.
Click NOwhen it asked you if you'll be jailbreaking an Apple TV
Click JailbreakNote that you don't have to follow the DFU directions anymore because you did it already in steps 3 to 5 (read again if necessary)
The rest of the process will take place on your iDevice. All you need to do is wait and keep it plugged in your computer. DO NOT INTERRUPT! Watch the video to see the complete process:
Once complete, you will find Cydia on the 2nd page of your iDevice's homescreen.
Credits: kidantvideos Posixninja (of the Chronic Dev) for greenpois0n Comex for making this jailbreak untethered geohot for limera1n exploit
This will guide you on activating, jailbreaking and unlocking your iDevice & thus will be of 2 parts: Part 1 - Jailbreak with redsn0w; & Part 2 Unlocking with ultrasn0w.
UNTETHERED JAILBREAK - iOS 4.2.1, 4.1, 4.0.2, 4.0.1 and 4.0
iPhone 3GS old bootrom
iPod touch 2G non-MC model
TETHERED JAILBREAK (?) - iOS 4.2.1 ONLY - you can use either greenpois0n or sn0wbreeze for untethered jailbreak, for these iDevices:
iPhone 3GS new bootrom
iPod touch 2G MC model
iPod touch 3G
iPod touch 4G
UNLOCK - iOS 3.0 up to 4.2.1
iPhone 3GS old bootrom
UNLOCK- iOS 3.0 up to4.0.2 ONLY
iPhone 3GS new bootrom
Not sure if your iPhone 3GS has old or new bootrom? CLICK HERE. Or if your iPod touch is MC or non-MC? CLICK HERE.
Compatible basebands (BB) for ultrasn0w 1.2.2:
06.15.00 - iOS 3.2.2 from iPad (read further for details)
05.13.04 / 01.59.00 - iOS 4.0.2, 4.0.1 & 4.0
05.12.01 - iOS 3.1.3
05.11.07 - iOS 3.1 & 3.1.2
04.26.08 - iOS 3.0
Notice that BB 05.14.02 & 05.15.04 are NOT part of the list. You need to update these BB to 06.15.00 for ultrasn0w unlock to work. Read further for more info.
However, if your BB is 05.13.04 or lower, you can proceed with jailbreaking but make sure you DO NOT INSTALL THE IPAD BASEBAND.
WARNING: Read the following consequences of updating BB to 06.15.00:
There is no way to come back down from 06.15, & there's no hiding the baseband version from Apple. You'll be voiding your warranty in a very obvious way.
If some future baseband comes out with a critical fix, you won't be able to update to it if it remains down in the 05.xx sequence (then again, you wouldn't update to it if you wanted to keep your unlock anyway).
Starting with FW 4.2.1 if you have 06.15 on your iPhone you won't ever be able to restore to stock firmware (it will fail). You'll need to only restore to custom IPSWs (then again, if you're unlocker you should already be doing that).
NOTE: Download iPad's 3.2.2 IPSW ONLY if you'll use PwnageTool. Also, download ONLY the IPSW for your current iOS version. CLICK HERE if you have no idea what version is installed on your iDevice, especially if it's currently disabled.
For jailbreaking other iOS versions like 4.3.2, use other versions of redsn0w. CLICK HERE to see the list of all redsn0w versions.
PART 1 - JAILBREAKING with redsn0w (all iDevices):
Connect your iDevice to the computer, run redsn0w & click Browse
Locate IPSW for your current iOS, select it & click Open
Wait until it say IPSW successfully identified. Click Next
If you plan to unlock your iPhone 3G / 3GS old bootrom, you need to check Install iPad baseband to update BB to 06.15.00 Click Yes if you're OK with these consequences:Again, you only need this option if your BB is either 05.14.02 or 05.15.04. This will result to updating your BB to 06.15.00 which can be unlocked using ultrasn0w. Also, if your BB is 05.13.04 or lower, this jailbreak will still work for your iPhone but make sure you DO NOT INSTALL THE IPAD BB! You don't need it! For iPod touch users, the BB thing does not apply for you. so you have nothing to worry about.
Choose some more options before you click Next
Turn OFF your iDevice & prepare to put it to DFU mode then click Next
DFU mode: Press & hold the POWER button for 3 seconds
DFU mode: Press & hold HOME button while still holding on the POWER button for 10sec
DFU mode: Release the POWER button but keep holding on the HOME button for another 15 seconds or until you see Jailbreaking... on redsn0w
Wait until it tells you that The rest of the process takes place on your iDevice. Click Finish That will take around 8 to 9 minutes to complete
Once the jailbreak is done, open your iDevice & you'll find Cydia on the 2nd page of your homescreen. Watch this video: PART 2 - UNLOCKING with ultrasn0w (iPhone ONLY):
Open CydiaDon't worry if Cydia's icon is blank/all-white, it will still work.The first time you open Cydia, this is what you'll see (image below), then it will close itself and take you back to the homescreen
Open Cydia again. Before you proceed with the unlock, go to Changes first and do a Complete Upgrade
Tap Reboot Device after the upgrade
After reboot, you can then unlock. Open Cydia again (for the third time), and tap the following (in sequence):
Tap Install, then tap Confirm
And finally, tap Reboot Device
And you're all done! Your iPhone should catch signal after the reboot.
If you want to see some screenshots on installing ultrasn0w, CLICK HERE.
For untethered jailbreak for all iDevices with iOS 4.1, CLICK HERE.
Credits: iPhone Dev Team for redsn0w & ultrasn0w kidantvideos
You can press "Power" and "Home" button of your device synchronically for a while until you see a white Apple logo appearing on your device. Then you can achieve DFU mode exit successfully on your device. How to Enter and Exit DFU Mode on iPhone
Download the latest ios on the net and also download snowbreeze.Input the ios in snowbreeze.You will then get a new custom firmware created by snowbreeze.You need to put your iphone 3G into Pawned DFU mode using iRecovery or Redsnow.In iTunes,on the "Restore" button, press SHIFT+click on mouse cursor and locate the custom firmware.Then you are good to go.If you get any iTunes errors,look on the net for its solution or you can ask me,
You enter dfu mode so iTunes can detect an iPhone
in recovery mode and then prompt you to restore. You will lose all your
files when you do this but if you have a backup in iTunes then you're
good to go. To enter dfu mode, just press both power and home buttons
simultaneously for exactly 10 seconds. After 10 seconds, release the
power but keep holding home then wait until iTunes detects your iphone
and prompt you to restore.
hold down the home and power button until you see the plug into itunes symbol. Once that is done start up itunes. then plug you're iphone into your computer via usb. but not until itunes is started. it should prompt you to do a restore.