Tip & How-To about Apple iPhone Smartphone

How to update iPhone 4 without updating the baseband

This will guide you on updating your iPhone 4 to iOS version 4.1 while retaining / keeping your baseband to 01.59.00.

This is for iPhone 4's which are currently on an older iOS version - 4.0.2, 4.0.1 or 4.0. If you didn't do when you update to 4.1, this process cannot downgrade your baseband from 02.10.04 to 01.59.00. This will only keep the 01.59.00 baseband when UPDATING to 4.1.

WARNING: This is for iPhone 4 ONLY! DO NOT attempt to do this on an iPhone 3GS or 3G. I tried this on one of my iPhone 3G, and it failed, the baseband was updated! The result, it can't be unlocked! I assume the same will happen on a 3GS although I haven't tested it yet.

Download Umbrella for PC (Windows) HERE.
Download Umbrella for Mac HERE.
Download iPhone3,1_4.1_8B117_Restore.ipsw HERE.

Save these files on your desktop for easy access.

Don't worry if you don't have a legit sim card, limera1n can hactivate your device. Please backup your iPhone 4 first before you continue.


  1. Open Umbrella and wait until it detects your iPhone 4
  2. Put a check mark on Advanced Options box
  3. On the Request Version, make sure that iPhone4 4.1 (8B117) is selected
  4. Click Save my SHSH and wait until the request is complete
  5. Click Start TSS Server (iTunes sill be closed after that)
  6. Open iTunes
  7. For PC (Windows) users, press and hold SHIFT on your keyboard.For Mac users, press and hold option on your keyboard.... then, click Restore
  8. Browse for iPhone3,1_4.1_8B117_Restore.IPSW and click Choose
  9. Click Restore and wait until it finish
  10. An error (1004) message will pop up after the restore , just ignore it and click OK. This is exactly what we want to happen to keep the baseband to 01.59.00
  11. Click No Thanks on the next message, then click OK on the other
  12. Return to Umbrella
  13. Click Kick Device Out of Recovery and wait for your computer to recognize your iPhone 4 again
  14. Finally, go back to iTunes and restore from your last backup.
That's it! Now to check, go to Settings>General>AboutAnd you should have Version 4.1 and Modem Firmware (baseband) 01.59.00

Now, CLICK HERE to jailbreak your device with limera1n.

Watch this video:

Again, do not try this on 3GS or 3G, please wait for further notice.

notcom for Umbrella

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How to Unlock iPhone 4 Since Apple is selling unlocked iPhone 4s internationally, it is only the United States users who are still locked on AT&T network. So if you want to use your new iPhone 4 on networks other than AT&T, like T-Mobile for example, you can use this newly released Ultrasn0w 1.0 software to unlock your phone. Simply follow the instructions posted below to unlock your iPhone 4 on iOS 4.0.1 / 4.0 on 01.59.00 baseband. NOTE: T-Mobile US users will have to disable 3G by navigation to: Settings->General->Network and turning the "Enable 3G" switch to OFF before installing the ultrasn0w unlock. How to: Jailbreak iPhone 4 on iOS 4.0.1: Step 1: Unlocking requires that your phone is jailbroken on the latest firmware. Follow the complete guide posted here to jailbreak your iPhone 4 on iOS 4.0.1 / 4.0 using JailbreakMe 2.0. How to: Unlock iPhone 4 (Any Baseband) on iOS 4.0.1: Step 2: Once you are done with the jailbreak, you can now unlock your iPhone on any baseband using Ultrasn0w 1.0-1 from Cydia. To do this: Start "Cydia" on your iPhone. Touch on "Manage" tab on the bottom. Now touch on "Sources" as seen in the screenshot below: Touch on "Edit" and then on "Add". You will be prompted to enter a url source as seen in the screenshot below. Type "http://repo666.ultrasn0w.com" and touch on"Add Source" to add this repo if you haven't already. Cydia will now automatically update your sources by following a series of automated steps. After installation is completed. Search for "ultrasn0w 1.0-1" in Cydia and install this application. This app will automatically unlock your iPhone so that you can use it with any carrier. Step 3: Now simply restart your iPhone and voila! you should now have a fully unlocked iPhone 4 ! Disclaimer: This guide is for testing & educational purposes only. I'm not responsible for any loss of important data or malfunctioning of your iPhone.

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Hi i write hear because i have a big problems! I used this guide an everything was perfect until i decided to restore my iphone 3g with itunes. i had 1015 error so i tried to instal redsn0w again but alvays when i finsh the instalation proces i get screet to conect my iphone to itunes and the same thing again and again. How should i restore my iphone, is there any way to do that ?? please i just bought my phone one weak ago!

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