UPDATE : If you get a 1600 error while trying to restore to a custom firmware here, try this.

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iPhone 2G and 3G users can now safely update to 3.1 firmware without updating the baseband (for unlock). If you are not the one to download all the various files and just want the ultimate result, these files are waiting for you to download! If you rather want to start from scratch, download Pwnage 3.1 tool for Mac.

3utools Custom Ipsw Pro

September 22, 2020. Apple Inferius, Inferius - Create & Restore custom IPSW, Inferius free release, Inferius Options. Inferius can be used to downgrade 64-bit iOS devices to previous versions. Also, the tool can be used for/by other applications as well. Also, it is vulnerable to checkm8. It is used to flash IPSW firmware files over the Windows 10 Command Line. Steps to install iOS 14 Beta by Windows 10 Command Line. Extract the libimobile2020-master.zip file to a separate folder on the local disk of your computer which is usually C. Rename the IPSW firmware file you have downloaded to 'ios14.ipsw'.

3utools Custom Ipsw Download

• Caution #1 : Please proceed further only if you have an iPhone 2G/3G. iPhone 3GS files can be downloaded here.
• Caution #2 : A restore is going to wipe the iPhone clean. Hence, please backup your iPhone using iTunes and then proceed.

More info about these custom firmware files : Has factory boot logos (Apple and restore cable), Only Cydia, No Icy, Default root partition…

Step 1a) Download Files for iPhone 2G (Please read the following carefully)

3utools Custom Ipsw Tool

• Download the following files ONLY if you have an Official iPhone contract with your cell carrier (ATT and others….)

OR

• Download the following files ONLY if you don’t have an iPhone contract (T-Mobile and others…)

3utools Custom Ipsw Free

• Download the following files ONLY if you have an Official iPhone contract with your cell carrier (ATT and others….)

OR

• Download the following files ONLY if you don’t have an iPhone contract (T-Mobile and others…)

Step 2) Join the downloaded files

• The files downloaded above have an extension .001 and .002. They need a special opensource (free) software HJSplit to join.

Download HJSplit to join both the files – Link for Windows Computers here and Macs here.

Step 3) Restore the firmware in iTunes 9.1

• You should now have the respective firmware file with an extension .ipsw . Please follow the steps in order.

Launch iTunes and connect the iPhone to your Mac / Windows computer.

If you are aware of DFU mode, proceed further. If not, watch this quick video and pay close attention to the steps to achieve DFU mode.

Turn your iPhone off. Press and hold the Home button and the Power button at the same time for 10 seconds.

After exactly 10 seconds release the Power button. Continue holding the Home button until iTunes pops up a message saying that it has detected an iPhone in recovery mode.

The iPhone will show you a blank screen (black).

Click on ‘Ok’ to the prompt displayed and hold Option key on your Mac and then hit Restore button. For Windows, hold the shift key and then hit the restore button. In the dialog box that pops up, browse the downloaded custom firmware file.

Step 4) Give it few minutes to perform the restore. Once the iPhone is up and running, proceed for software Unlock using Cydia. Follow this guide to install Ultrasn0w to software unlock your iPhone 3G. iPhone 2G is already unlocked with this custom firmware!

You are now good to go! Post a comment if you are stuck at any of the steps described above.