iOS 7.1.2 (11D257) firmware is the latest official version of the operating system for the iPhone 4 (GSM). This firmware includes numerous improvements and fixes aimed at enhancing the stability and security of the device. In this article, we will review the process of reflashing the iPhone 4 to iOS 7.1.2, as well as verifying the hash of the downloaded firmware to ensure its authenticity.
What is iOS 7.1.2 (11D257) Firmware?
iOS 7.1.2 (11D257) firmware is an update for the iPhone 4 operating system, released in June 2014. It includes important security fixes and stability improvements, making it recommended for all users of this device.
Firmware Hash Sums
To verify the authenticity of the firmware file, use the following hash sums:
- SHA256:
8df4acce2cc2989ad159f980dd65a4bdc8c9eab4000e35169baa70ceb8749b2d - MD5:
6ed6cb1c2eac7177f96c9fbcf04a4f34 - SHA1:
81da17b3e893a61508fe203849b7e1f60e2127b1
Step 1: Preparation for Reflashing
- Ensure you have iTunes installed (for Windows and macOS) or idevicerestore (for Linux).
- Connect the iPhone 4 (GSM) to your computer using a USB cable.
Step 2: Verify 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 iPhone3,1_7.1.2_11D257_Restore.ipsw -Algorithm SHA1
- Compare the resulting 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 iPhone3,1_7.1.2_11D257_Restore.ipsw
- Compare the resulting 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 iPhone3,1_7.1.2_11D257_Restore.ipsw
- Compare the resulting hash with the one listed above.
Step 3: Reflashing the iPhone 4 (GSM)
Windows (using iTunes):
- Open iTunes.
- Put the iPhone into recovery mode: Turn off the iPhone, hold down the “Home” button, and connect the device to the 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
iPhone3,1_7.1.2_11D257_Restore.ipswand confirm the restoration.
Windows (using 3uTools):
- Download and install 3uTools from the official site.
- 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
iPhone3,1_7.1.2_11D257_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 iPhone3,1_7.1.2_11D257_Restore.ipsw
- Wait for the restoration process to complete.
Device Description: iPhone 4 (GSM)
iPhone 4 (GSM) was released in June 2010. It is the fourth smartphone from Apple and brought significant improvements over previous models. It features a 3.5-inch Retina display with a resolution of 640×960 pixels, an Apple A4 processor, and 512 MB of RAM. The device has a 5 MP camera and supports HD 720p video recording. The iPhone 4 runs on iOS 7.1.2, the latest official version of iOS for this device. Support for the iPhone 4 ended in September 2016.
By following these instructions, you can successfully reflash your iPhone 4 to iOS 7.1.2 and verify the authenticity of the downloaded firmware.
