Apple device Untethering Vs Tethering

 Hi friends,

After a successful jailbreak on the iPhone 4, I was confused between Untethered jailbreak and Tethered jailbreak.

Tethered Jailbreak:

Tethered jailbreak on a device requires, the device to be connected to PC/Mac for every reboot.
Advantage:
Less time in the process for jailbreaking.
Disadvantages:
Warranty will be void.
Reboot of the jailbroken device need to be connected to PC/Mac :(

Untethered Jailbreak:
When the device has undergone untethered jailbreaking, it can rebooted like normal device, unlike tethered one.
Advantage: No need of PC/Mac to restart the device
Disadvantage: Warranty will be void

References:

Apple’s Official Response To DMCA Jailbreak Exemption: It Voids Your Warranty

From Apple Support, jailbreaking the device causes issues listed in the below site:

Unauthorized modification of iOS has been a major source of instability, disruption of services, and other issues

 

Successfully Jailbroken the iPhone 4 with iOS 4.3.3 in Windows XP

Hi friends,

I have successfully jailbroken the iPhone 4 with iOS 4.3.3 of my friend. After watching lot of videos from Youtube, I followed these steps.


Pre-Requisites:
Download and install latest iTunes on PC
Download Apple iOS 4.3.3 firmware IPSW file
Download latest RedSn0w for Windows

Procedure:

• Unzip the RedSn0w file and execute the "redsn0w.exe" file (Better to run the exe as "Run as Administrator")
• Click on "Browse" and select the downloaded iOS 4.3.3 firmware file "iPhone3,1_4.3.3_8J2_Restore.ipsw"
• Click on "Next"
• The "iPhone3,1_4.3.3_8J2_Restore.ipsw" file will get processed and patches will be applied to iOS kernel
• Select the "Install Cydia" option, if it hasn't selected
• Click "Next"
• Please see the instructions carefully
• In this step, you need to switch off the device and iPhone should be connected to PC
• Now, we need perform very important step of the jailbreaking, i.e. putting iPhone in DFU mode
• Press and hold the "Power Button" for 3 seconds
• Now, without leaving the "Power Button", press and hold the "Home" button of the iPhone for 10 Seconds
• Final step, Leave the "Power Button" but hold the "Home" button of the iPhone device for 15 Seconds
• You can see on PC that it was successfully entered into DFU mode
• You can see some commands are running on the iPhone 4 (Don't get scared, no issue with your device)
• After successfully jailbreak the device, iPhone will get rebooted.

Jailbreak Verification Step:

• If the device is Jailbreaked then the Cydia app will be installed on your iPhone
• You can browse the iOS filesystem from it

Problems and Solution:

• If you have problems in entering into DFU mode, then the iPhone will move to "Restore" mode
• To come out of "Restore" mode, Press and hold the both "Power Button" and "Home Button" for 10 Seconds
• Again do the procedure from start

References:
http://www.iphone4jailbreak.org/redsn0w-jailbreak-4-3-3-redsnow-un-tethered-jailbreak.html
https://sites.google.com/a/iphone-dev.com/files/home/