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My iphone 3g ios 4.2.1 wont go into dfu mode

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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.

Posted on Mar 20, 2011

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Search google for a program called tiny umbrella.

Posted on Mar 20, 2011

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How to jailbreak iOS 4.2.1 all iDevices: iPhone 4/3GS/3G, iPod Touch, iPad &...


This will guide you on using greenpois0n RC6.1 to jailbreak your iDevice with iOS 4.2.1:
  • iPhone 4
  • iPhone 3GS
  • iPod touch 4G
  • iPod touch 3G
  • iPad
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:
  1. Plug your iDevice to your computerkid_ant_10.png
  2. Open iTunes & prepare to put your iDevice to DFU modekid_ant_10.png
  3. DFU Mode: Press and hold both POWER and HOME buttons for EXACTLY 10 secondskid_ant_10.png
  4. DFU Mode: Release the POWER button but keep holding the HOME button for another 15 to 20 secondskid_ant_10.png
  5. 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:kid_ant_10.pngkid_ant_76.jpgkid_ant_10.pngkid_ant_77.jpgkid_ant_10.pngClick on image to view larger.kid_ant_10.png
  6. Close iTuneskid_ant_10.png
  7. Open greenpois0nkid_ant_10.pngkid_ant_15.pngkid_ant_11.pngkid_ant_10.png
  8. Click NO when it asked you if you'll be jailbreaking an Apple TVkid_ant_10.pngkid_ant_73.jpgkid_ant_10.png
  9. Click Jailbreakkid_ant_10.pngkid_ant_74.jpgkid_ant_10.png Note 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)kid_ant_10.pngkid_ant_12.png
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:kid_ant_10.png
kid_ant_10.png

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


on Mar 25, 2011 | Apple iPhone Smartphone

2 Answers

Exit dfu mode on iphone 5c and not loose data


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

Oct 12, 2014 | Cell Phones

2 Answers

Iphone stuck on itunes recovery mode


Your device stucks in DFU mode, you can try some 3rd party ios data recovery tool to exit recovery mode. Follow this guide to have a try DFU Mode How to Enter and Exit DFU Mode of Your iOS Device

Aug 12, 2014 | Apple iPhone 3G

2 Answers

Solution


You should just be able to plug into iTunes and restore it that way. No apps needed. No need to jailbreak (especially if you don't want to jailbreak it).

May 04, 2014 | Apple iPhone 3G

1 Answer

I have an older iPhone 3g with ios 2.1 and it will not update!


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,

Mar 19, 2013 | Apple iPhone 3G

2 Answers

What is dfu mode


this Mode use when you want to install new ios OR upgrade/downgrade your version so that it will recognize by the software.

Hold the power button and home button for 15 seconds the both with each other.

Then release the power button but keep holding the home button for another 15 seconds.

The iPhone screen will remain black - now your on DFU MODE

Jan 14, 2013 | Apple iPhone Smartphone

3 Answers

What is dfu mode and how do you do it


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.

Nov 26, 2011 | Apple iPhone Smartphone

1 Answer

Hi, my iPhone 3G is stuck at the apple logo and would reboot over and over again forever! The main problem is that it charges from the wall and charges from my laptops, yes i have two. also i can put it...


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.

Feb 13, 2011 | Apple iPhone 3G Black Smartphone

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