iPhone 3G, despite its age, remains popular among enthusiasts. Firmware iOS 4.2.1 (8C148) is the latest official version for this device. In this article, we will look at how to reflash the iPhone 3G to iOS 4.2.1 and how to check the hash of the downloaded firmware.
What is iOS 4.2.1 (8C148) firmware?
Firmware iOS 4.2.1 (8C148) is the latest version of the iOS operating system for the iPhone 3G, released on November 18, 2010. It includes many improvements and fixes that enhance the stability and performance of the device.
Firmware Hash Sums
To verify the authenticity of the firmware file, use the following hash sums:
- SHA256: 98e5969c3baed660c9a26e94cd7ed4b3cdb7175900f448bcc2223bf885835ce0
- MD5: 8b1657935408a1638b69740b282f62b3
- SHA1: d2ed58586e8ca2153f2e2ec585bba8afc5173378
Step 1: Preparation for Reflashing
- Make sure you have iTunes installed (for Windows and macOS) or idevicerestore (for Linux).
- Connect the iPhone 3G to your computer using a USB cable.
Step 2: Checking the Hash of the Downloaded Firmware
Windows:
- Open PowerShell and navigate to the folder with the firmware file, for example, cd Downloads.
- Enter the command:
Get-FileHash iPhone1,2_4.2.1_8C148_Restore.ipsw -Algorithm SHA1
- Compare the obtained hash with the one listed above.
macOS:
- Open Terminal and navigate to the folder with the firmware file, for example, cd ~/Downloads.
- Enter the command:
openssl sha1 iPhone1,2_4.2.1_8C148_Restore.ipsw
- Compare the obtained hash with the one listed above.
Linux:
- Open Terminal and navigate to the folder with the firmware file, for example, cd ~/Downloads.
- Enter the command:
openssl sha1 iPhone1,2_4.2.1_8C148_Restore.ipsw
- Compare the obtained hash with the one listed above.
Step 3: Reflashing the iPhone 3G
Windows (using iTunes):
- Open iTunes.
- Put the iPhone into recovery mode: Turn off the iPhone, hold the “Home” button, and connect the device to your computer. Keep holding the “Home” button until the recovery mode screen appears.
- Hold down the Shift key and click “Restore iPhone”.
- Select the firmware file iPhone1,2_4.2.1_8C148_Restore.ipsw and confirm the restoration.
Windows (using 3uTools):
- Download and install 3uTools from the official website.
- Put the iPhone into recovery mode as described above.
- Go to the “SmartFlash” section and select “Easy Flash”.
- Click “Import Firmware” and select the firmware file iPhone1,2_4.2.1_8C148_Restore.ipsw.
- Click “Flash” and wait for the process to complete.
macOS:
- Open Finder.
- Put the iPhone into recovery mode as described above.
- Hold down the Option key and click “Restore iPhone”.
- Select the firmware file and confirm the restoration.
Linux:
- Install idevicerestore (follow the instructions on GitHub).
- Put the iPhone into recovery mode as described above.
- Open Terminal and navigate to the folder with the firmware file.
- Enter the command:
idevicerestore -e iPhone1,2_4.2.1_8C148_Restore.ipsw
- Wait for the restoration process to complete.
Device Description: iPhone 3G
iPhone 3G was released in July 2008. It supports 3G networks and features a 3.5-inch display with a resolution of 320×480 pixels. The device is equipped with a Samsung S3C6400 processor and 128 MB of RAM. It comes with a 2 MP camera and runs iOS 4.2.1, the latest official version of iOS for this device.
By following these instructions, you will be able to successfully reflash your iPhone 3G to iOS 4.2.1 and verify the authenticity of the downloaded firmware.
