If you hit a 1604, 1603, 1602, 1601, 1600 error while trying to restore your iPhone with a custom iOS 5.0.1 firmware file created using Redsn0w then there is now a way to bypass the error.iH8sn0w, developer of Sn0wbreeze has released a new version of iREB tool after almost 10 months, which is compatible with iOS 5.0.1.


iREB is a tool that will put your iOS device into a pwned state so that you can upload custom firmware to it.In addition to the iOS 5.0.1 support, iREB r5 includes a number of fixes and improvements:

• Much smaller file size (390kb).
• Fixed USB 3.0 issues.
• iREBs speed for the iPhone 2G/iPhone 3G/iPod Touch 1G has
• increased significantly!
• Fixed rare DFU detection issues.
• Updated limera1n/steaks4uce payload to not hook "cmd_go"
• on 4.x images (nothing severe, but useless here).

iREB is currently available for only Windows. You can download iREB r5 using this link.
We havent tried it out yet, but if youre looking for a step-by-step guide, you can checkout below to get an idea on how to use it.
====How To Fix 1604, 1603, 1602, 1601, 1600 Error While Restoring Custom iOS 4.2.1 IPSW Firmware File Using iREBIf you hit a 1604, 1603, 1602, 1601, 1600 error while trying to restore your iPhone with a custom iOS 4.2.1 firmware file created using Sn0wbreeze 2.2 for Windows or PwnageTool 4.2 for Mac then there is a way to bypass the error.iH8sn0w, developer of Sn0wbreeze has released a new version of iREB tool, which is compatible with iOS 4.2.1.

iREB is a tool that will put your device into a pwned state so that you can upload custom firmware to it.iREB RC3 supports the following iOS devices:

• iPhone 2G, iPhone 3G, iPhone 3G[S] (old & new bootrom), iPhone 4
• iPod Touch 2G (MB & MC), iPod Touch 3G, iPod Touch 4G
• iPad
• Apple TV 2

iREB is currently available only for Windows users.Before we start please note that that jailbreaking your iOS device may void its warranty and hence proceed with caution and at your own risk.You can follow these simple step-by-step guide to bypass the 1604, 1603, 1602, 1601, 1600 errors:

• Download the latest version of iREB from iH8sn0w
• Start iTunes (iREB needs iTunes 10 or above, it’s a good idea to use the latest version of iTunes – iTunes 10.1.2 as of now)
• Put your iOS device in DFU mode by following these steps:
  • iPhone/iPad/iPod Touch
    • Connect your iPhone/iPad/iPod Touch to your computer
    • Turn it off
    • Hold power and home together for 10 seconds (exactly).
    • Release power but keep holding home until the computers beeps as a USB device is recognized
    • A few seconds later iTunes should detect your iOS device
  • Apple TV 2
    • Connect your Apple TV 2 with your Computer via microUSB
    • Now reboot your Apple TV by holding down Menu + Down buttons together for around 6 seconds
    • After reboot, immediately hold Menu + Play until you see the message in iTunes saying that Apple TV in recovery mode is detected
• Now close iTunes and launch the iREB tool that you had downloaded earlier
• Click on the relevant device from the iREB screen and wait for few seconds until you get a white or red screen on your iOS device
  
• Now start iTunes again and select your iOS device from the left hand side side bar
• While on the iTunes window, hold the Shift key and click on the Restore button. (This is a VERY IMPORTANT STEP as just clicking the ‘Restore’ button without the ‘Shift’ button will result in restoring your iPhone with the latest firmware, by holding down the ‘Shift’ button, allows you choose the custom iOS 4.2.1 firmware file created using PwnageTool or Sn0wbreeze)
• Navigate and select the custom iOS 4.2.1 IPSW file to restore your iOS device with it

You should now be able to successfully restore your iOS device with the pre-jailbroken iOS 4.2.1 firmware file without hitting the 1604, 1603, 1602, 1601, 1600 error.

iOS: How to back up

Summary

This article describes how to back up your iPhone, iPad, or iPod touch using iCloud or iTunes.

Products Affected

iPad, iPhone, iPod touch

iCloud and iTunes can back up most data on your iPhone, iPad, or iPod touch.
Backed-up information includes purchased music, TV shows, apps, and books^*; photos and video in the Camera Roll; device settings (for example, Phone Favorites, Wallpaper, and Mail, Contacts, Calendar accounts); app data; Home screen and app organization; Messages (iMessage, SMS, and MMS), ringtones, and more. Media files synced from your computer aren’t backed up, but can be restored by syncing with iTunes.
* Backup of purchased music is not available in all countries. Backup of purchased TV shows occurs only in the United States. Previous purchases may not be restored if they are no longer in the iTunes Store, App Store, or iBookstore.
Collapse All Sections | Expand All Sections

iCloud

How to back up

iCloud automatically backs up the most important data on your iOS 5 device. After you have enabled Backup on your iPhone, iPad, or iPod touch in Settings > iCloud > Backup & Storage, it will run on a daily basis as long as your device is:

• Connected to the Internet over Wi-Fi
• Connected to a power source
• Screen locked

You can also back up manually whenever your device is connected to the Internet over Wi-Fi by choosing Back Up Now from Settings > iCloud > Storage & Backup.

To learn more about what is backed up, see the iCloud: Backup and Restore Overview article.

How to restore from a backup

When you go through Setup Assistant on a new iOS 5 device, choose "Restore from iCloud Backup" and enter your iCloud account and password. You will see the three most recent backups for each of the devices on which you enabled Backup. Choose from which backup to restore.

After your device restarts, your settings and accounts are restored and Backup starts downloading your purchased music, TV shows, apps, books, Camera Roll, and other content^*. You may be prompted to enter the passwords for all accounts enabled on your device.
A progress bar will appear underneath the apps that are being downloaded. To prioritize the restore of a specific app, tap its icon. Restore will attempt to download the same version of the app that you had installed previously. If that version is no longer available, the latest version of the app will be restored.

To check if the restore is complete, go to Settings > iCloud > Storage & Backup. Complete the setup assistant after erasing your device (by going to Settings > General > Reset > Erase All Content and Settings) or after starting your new device. When prompted to set up as new or to restore from previous backup, choose to restore from iCloud backup. Then enter your AppleID and password.


iTunes

How to back up

iTunes can create backups of your iOS device when you:

• Sync with iTunes (disabled if you have iCloud backup turned on)
• Right-click (or Control-click) the iOS device in iTunes under Devices and choose Back Up

Use these steps to manually back up your iOS device using iTunes:

1. Connect your iOS device to a computer with the latest version of iTunes installed
2. Select your iOS device in iTunes under Devices
3. Right-click (or Control-click) the device and select Back Up

iOS device backups preserve your settings, the Camera Roll (or Saved Pictures), and other important data. Learn more about what is stored in a backup.

How to restore from a backup

To restore information from a backup, use one of the following methods after connecting your iOS device to the computer with which you normally sync:

• Right-click (or Control-click) the device and choose Restore from Backup
• If you have a new phone, you can connect to iTunes and it will prompt to restore from your backup

Additional Information

These are instructions on how to jailbreak your iPad 1 on the 4.3.5 firmware using RedSn0w for Windows. The Mac version of this tutorial is here. If you are on 4.3.3 or lower make sure you do NOT update to iOS 4.3.5. Use the untethered JailbreakMe instead. You can find the appropriate JailbreakMe tutorial here.

Step One
Create a folder on your desktop called Pwnage

Download RedSn0w from here and place it in the Pwnage folder. Likewise, download the latest 4.3.4 and 4.3.5 firmware from below and place it in the same folder.

4.3.4 (iPad 1): iPad1,1_4.3.4_8K2_Restore.ipsw
4.3.5 (iPad 1): iPad1,1_4.3.5_8L1_Restore.ipsw

Extract the RedSn0w zip file into the same folder.


Step Two
Connect your iPad to the computer and launch iTunes.


Select your iPad from the list of devices on the left. Now hold down Shift and click the Restore button. Restore is preferred as it wont create any wasted space on your iPad.


Navigate to the Pwnage folder on your desktop and select the 4.3.5 firmware ipsw. Click the Choose button to continue.


Step Three
Once iTunes has finished updating your iPad to the desired firmware open the Pwnage folder on your desktop and launch the redsn0w application from the redsn0w folder we extracted earlier.

**Windows 7 users may need to run RedSn0w in Vista Compatibility mode. You can do this by right clicking the executable and selecting Properties from the contextual menu.


Step Four
Once RedSn0w opens click the Browse button


Step Five
Select the 4.3.5 firmware ipsw we placed in the Pwnage folder on our desktop then click Open.


Step Six
Once the firmware has been verified click the Next button to continue.


Step Seven
RedSn0w will now prepare the jailbreak data


Step Eight
From this window you can select the jailbreak options you would like. Make sure Cydia is selected and click the Next button to continue.


Step Nine
Please plug your iPad into the computer and make sure its OFF then click the Next button


Step Ten
RedSn0w will now guide you through the steps to get into DFU mode. You can find more help with DFU mode here


Hold down both the Home button and the Power button for 10 seconds.


Release the Power button and continue holding the Home button until RedSn0w detects the device.


Step Eleven
Your iPad will now reboot


Step Twelve
RedSn0w will then begin uploading the new RAM Disk and Kernel.


Step Thirteen
Once this is complete you will be notified that RedSn0w is done. Click the Finish button. When your iPad finishes rebooting (5 minutes or so) it will be jailbroken with Cydia on the SpringBoard.



BOOT TETHERED
Since this is a tethered jailbreak you must use Redsn0w to help you boot back into your jailbroken device if its powered off for any reason. Simply connect your iPhone to the computer, launch RedSn0w, select Just boot tethered right now from the options window and click Next to have RedSn0w boot your device.


*As usual a big thanks to the iPhone Dev-Team for their hard work and contribution to the iPhone community.
**Windows 7 users can try running RedSn0w as an administrator in Windows Vista or XP compatibility mode if you experience any difficulties