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My speed tests of iOS 4 Gold Master VS iPhone OS 3.1.2 on 2 identical 2nd Gen. iPod Touch’s.
Overall iOS 4 is much slower on this older iPod. You may want to think twice before upgrading since you do not gain many features on older hardware.

This method has been tested and works with iPhone OS 1.14 thru 3.1.3  and on all iPhone models (2G, 3G, 3GS) not tested on iPod Touch, but should work.

HAS NOT BEEN TESTED ON ITUNES 9.2 OR  Apple IOS4 (CURRENT VERSIONS)

**WARNING– Unlockers WILL LOSE carrier unlock with this method if they update to 3.1.3 or 4.0 in iTunes!**

*Try the following procedure at your own risk, you WILL lose all your data (music, photos, high scores, etc.. ) with this method but will have a working phone again. You just need to re-sync with iTunes to get your apps, songs, movies, etc.. back after your phone is fixed*

**Unlockers WILL LOSE carrier unlock with this method if they update to 3.1.3 or 4.0 in iTunes!**

I’ve found from much trial and error that having too many iPhone “official” 3rd Apple App store apps installed when you try to jailbreak the phone may sometimes cause the phone to hang up in a state of constant reboot.

Although I can’t and don’t guarantee this will work 100% of the time, if you’ve tried to jailbreak your iPhone and your phone gets stuck at the Apple Logo and reboots every 5-10 minutes, you need to follow these steps:

Setting the iPhone to recovery mode allows you to perform firmware restore using iTunes.

1) Power off the iPhone by depressing both the sleep/wake button on the top of the iPhone and the home button. Wait for the iPhone screen to turn black aka screen-off.

2) Depress the home button and connect the iPhone/iPod sync cable into the docking port on the bottom of the iPhone at the sametime without removing pressure on the home button.

3) You should be able to see the Apple logo coming up on the iPhone and then the recovery screen with be shown after the Apple logo:

4) iTunes will start and inform you that it has detected an iPhone in recovery mode and you should restore your iPhone to start using it.

5) Perform your firmware restore.

6) Exit iTunes and Re-jailbreak. I highly recommend using Spirit jailbreak but you can use, Pwnage Tool or BlackRa1n (or whatever jailbreak tool that will work on your model iPhone). Run the jailbreak app again and everything should go fine. Spirit takes about 3 minutes to jailbreak a 3GS and about 5 minutes to complete an older model.

7) Don’t restore from a backup, just set up your phone as a new phone, then re-sync to add back all your data and apps.

DONE!

ONCE AGAIN, **Unlockers WILL LOSE carrier unlock with this method if they update to 3.1.3 or 4.0 in iTunes and I can’t guarantee this will work 100% of the time, also I am not responsible for any lost data or a bricked phone or anything other problems encountered from trying this method.  Try at your own risk, leave a comment and I’ll try to help out with any issues.

As always when a new firmware is being realeased, there is always a few unlucky people who “accidentally” update or restore to the latest firmware, thus losing their jailbreak and unlock.

In this case, you’d usually want to downgrade your iPhone from 3.1.3 to 3.1.2 simply by downloading 3.1.2 and SHIFT + Restore in iTunes so that you can choose your own firmware to restore to.

The problem is that Apple recently stopped signing all previous firmware versions making it impossible for you to downgrade.

Read Here for a Possible Solution!

**UPDATE**  This information only applies to iPhone OS 2.2.1 and earlier.  Redsn0w used for jailbreaking OS 3.0 REQUIRES  iTunes 8.2 or higher.

Apple has released iTunes 8.2 in Software Update, to support the upcoming iPhone 3.0 firmware. iTunes 8.2 is not supported current versions of QuickPWN and Pwnage tool. This means you can’t jailbreak an iPhone with iTunes 8.2 so we will need to wait Newer versions of QuickPWN and Pwnage tool.

If you’ve accidenally installed 8.2 and need to uninstall it on a Mac, you can follow Apple Support’s article or try the following:

Type the following commands in terminal and make sure that

iTunes is not running before trying this.

sudo rm -rf /Applications/iTunes.app /System/Library/PrivateFrameworks/DeviceLink.framework /System/Library/Extensions/AppleMobileDevice.kext /System/Library/PrivateFrameworks/iTunesAccess.framework /System/Library/PrivateFrameworks/CoreFP.framework /System/Library/PrivateFrameworks/MobileDevice.framework

For Windows, uninstall the program in “Add/Remove Programs” in the Control Panel

Once the operation performed, Download iTunes 8.1 from here and Install.

You can try this method to fix a iPhone stuck at the boot logo.  You won’t have to restore your phone and loose your saved games scores and other data. It might work providing you are able to get SSH access, which isn’t always possible.

• Turn ipod or iphone off
• connect Sync cable
• turn on ipod iphone
• listen for USB device “chime” (Window) or wait about 15 seconds on a Mac
• ssh to your iPhone
• navigate to /var/mobile/
• rename Applications folder to Applications2
• wait 5 second and your springboard will pop up
• now rename Applications back and restart

I haven’t tested this method, but its worth a try.

Jailbreaking is a process used to gain unrestricted (root) access to the iPhone’s Unix based filesystem. It allows you to install apps that are not authorized by Apple and/or not possible to develop given the restrictions of the Official iPhone SDK and its license agreement. It is not the same as unlocking the Phone for use with any carrier.

Here’s a few of my favorite Jailbreak apps that you’ll probably never see on the Apple App Store:

• Cycorder / Video Recorder – Let you capture decent quality video w/ built in camers
• xGPS – Turn by Turn GPS App with Voice Guidance.
• Intelliscreen – view email, sms, calendar, weather, news on lockscreen, also includes speed dialer for lockscreen.
• MySMS – Landscape SMS with advanced feature such as message forwarding, even email forwarding!
• SwirlyMMS – MMS for iPhone!
• MxTube – Download and save YouTube video
• Winterboard - Add custom themes, icons and wallpaper behind icons.
• iPhoneModem – Let you use iPhone as modem and give your laptop connection to Internet
• NES Emulator – Play classic Nintento games (Super Mario Bros, Duck Hunt, etc..)

Jailbreaking is a process used to gain unrestricted root access to the iPhone’s Unix based filesystem. It allows you to install apps that are not authorized by Apple and/or not possible to develop given the restrictions of the Official iPhone SDK and its license agreement.

The only reason I ever even considered jailbreaking my phone was to gain the added functionality it provides.

Some added functionality you can gain by Jailbreaking include:

• MMS Messaging,
• Copy and Paste,
• Video Recording,
• Turn-by-Turn GPS
• Full featured SMS w/landscape view keyboard,  message forwarding, etc..
• Better photo taking w/ digital zoom
• Multitasking
• System-wide search
• Ability to add themes (change icons, add wallpaper to Home screen, etc..) and much more!

Downsides?

• Jailbreaking voids your warranty, so if your phone needs service you must restore the original firmware from iTunes before taking it in.
• Jailbreaking is risky, and takes many steps that must be performed exactly or it will fail.
• Updating Jailbroken phones to a new OS version (say 2.2 to 2.2.1) is tedious and time consuming, the phone must be first be updated via iTunes which un-jailbreaks and wipes all jailbreak apps off the phone, then you have to repwn it and reinstall all your jailbreak apps.
• Apple has recently declared jailbreaking illegal because, in their opinion,  it violates their copyrights by modifying their software without express permission.

Try at your own risk, but I couldn’t go back to the factory phone.

I’ve found from much trial and error that having a bunch iPhone 3rd App Store apps installed when you try to jailbreak the phone will cause the phone to hang up in a state of constant reboot.

To avoid this simply remove the apps before jailbraking by unchecking the Sync Applications checkbox in iTunes and pressing the ‘Sync’ Button to remove the apps.  Run Quickpwn and the phone should jailbreak fine, then reinstall your apps by re-checking the Sync Applications  box and syncing with iTunes to reinstall the apps, new apps can be downloaded and installed just as before jailbreaking the iPhone.