I phone 4
 

how to Jailbreak i phone 4 my i phone 4.2.1. any one advice me and give me tools download link . Thanks

use search button everything is there.
Unless u want some1 spoonfed..??

As stated the GreenPois0n is fully capable to jailbreak any iOS device. Our friends at RP have shared a few steps on how to jailbreak the iOS 4.2.1 on the iPhone 4, iPhone 3GS, iPod Touch, Apple TV and the iPad. Those steps are:

1. Download GreenPois0n and connect your iPhone or other iOS device to your computer. Once done simply hit jailbreak.

2. Enter the DFU mode by holding the Sleep button.

2a. Continue with holding the sleep button and press the Home button.

2b. Release the sleep button and continue holding home.

3. With the previous procedure completed, GreenPois0n will now jailbreak your iPhone untethered on the iOS 4.2.1.

4. Upon successful jailbreak, you can initiate Loader on the homescreen to install Cydia.

The initial release was a bit buggy so there has been an update with the GreenPois0n RC5_2. As for those who already have a tethered jailbreak using the Redsn0w 0.9.6 can simply run GreenPois0n to untether the existing jailbreak.

Download For Windows and Mac OS XGreenPois0n

So you can jailbreak untethered with this exploit?
 

But there is still no unlock for 4.2.1 once jailbroken the Iphone4 is that correct?

If the firmware has been upgraded to 03.10.01 then you are out of luck (hopefully Feb 28th something good will happen but dates have been mentioed before and have passed with nothing)

If you didn't use one of the nice jailbreak programs to perserve basebands then you likely have 03.10.01 (with no way to unlock currently without paying someone for a nice codE)

[QUOTE=riajul1988;6999570]As stated the GreenPois0n is fully capable to jailbreak any iOS device. Our friends at RP have shared a few steps on how to jailbreak the iOS 4.2.1 on the iPhone 4, iPhone 3GS, iPod Touch, Apple TV and the iPad. Those steps are:

1. Download GreenPois0n and connect your iPhone or other iOS device to your computer. Once done simply hit jailbreak.

2. Enter the DFU mode by holding the Sleep button.

2a. Continue with holding the sleep button and press the Home button.

2b. Release the sleep button and continue holding home.

3. With the previous procedure completed, GreenPois0n will now jailbreak your iPhone untethered on the iOS 4.2.1.

4. Upon successful jailbreak, you can initiate Loader on the homescreen to install Cydia.

The initial release was a bit buggy so there has been an update with the GreenPois0n RC5_2. As for those who already have a tethered jailbreak using the Redsn0w 0.9.6 can simply run GreenPois0n to untether the existing jailbreak.

Download For Windows and Mac OS XGreenPois0n[/QUOT

thanks for your usefull information . but your downlode link invalid

That link works just fine.:rolleyes: