Firmware Samsung I9100G Galaxy S II

OS: Android 2.3.4 (Gingerbread), upgradable to 4.1 (Jelly Bean); TouchWiz UI 4

CPU: Dual-core 1.2 GHz Cortex-A9

Display: 4.3" inc

Camera: 8 MP, Single

Before flashing, you need
Create a full backup of the firmware.
The battery must be 100% charged.

1. Flashing your phone using CWM Recovery
2. Flashing the phone using TWRP Recovery
3. Flashing the phone using Fastboot

1. Phone flashing using CWM Recovery
The rich functionality of CWM Recovery www.clockworkmod.com allows you to perform many manipulations with the device, including rolling the firmware. By default, stock Recovery is installed in the devices, which means that first you need to install the ClockWorkMod Recovery utility itself.
The general firmware process described below is for ZIP files. Instructions: - Download the firmware and place it on the phone's SD card.
- Then turn off the phone in any way.
- Press a certain combination of buttons on the phone, the combination may vary depending on the manufacturer of the phone. If you do not know the required combination, try pressing the following keys.
- Press the Power + Volume up (or Volume Down) (+Home) buttons together for 10-20 seconds.
- After that, Recovery mode will appear on the phone screen.
- Use the volume buttons to navigate the menu, and use the Power button to select.
- Select 'Wipe data / factory reset' from the Recovery mode menu.
- Select 'Yes - delete all user data' from the menu.
- Select 'Wipe cashe partition' from the menu and press the Power button.
- Select 'Yes - Wipe cache' from the menu.
- From the Recovery mode menu select 'advanced' .
- Select 'Wipe Dalvik Cache' from the menu.
- Select 'Yes - Wipe Dalvik Cache' from the menu and press the Power button.
Go back, press 'Go Back'.
- From the menu select 'mounts and storage' .
- Select 'format / system' and press the Power button.
- Select 'Yes - Format' from the menu and press the Power button.
Go back, press 'Go Back'.
- Select 'install zip from sdcard' from the menu.
- Choose 'choose zip from sdcard' .
- Select 'Yes - Install your firmware name' from the menu and press the Power button.
- Next in the menu select 'Reboot system now' .

2. Flashing the phone using TWRP Recovery
For those who prefer working with the utility in the form of TWRP Recovery, the following instructions for the step-by-step installation of the update in the form of a ZIP archive are offered:
- Upload the file with the firmware image to the phone's SD card.
- Go to TWRP Recovery. Just like in CWM.
- Perform a factory reset. When cleaning the phone is finished, return to the original menu by pressing the 'Back' key.
- In the main menu, select 'Install' and select the firmware file. Click on it by dragging the slider to the side.
- The process of flashing the phone will take 2-3 minutes.
- After completion, you must click on the 'Reboot System' item, and reboot the device.

3. Flashing the phone using Fastboot
A universal tool for flashing Android smartphones using a PC is the Fastboot utility. It is part of the SDK Platform Tools, which means it is suitable for a large number of devices.
Before starting the firmware, you need to get access to the system kernel. Very often, many manufacturers block this system parameter, not wanting users to change the system files of their firmware images with their own hands. To do this, you need to unblock Bootloader. To do this, you need to study the detailed instructions for configuring and managing the command line. Before starting the firmware using a computer, do not forget to enable USB debugging of the device in the engineering settings of the device.
- Copy the .zip archive with the firmware image to the folder with 'ADB'
- Put your device into fastboot mode and write the prompt in the command line: fastbooflash zip filename.zip.
- Wait for the end of the installation and reboot your phone.

Thomas Nilan
Smartphone Expert

Thomas Nilan is a mobile phone expert with in-depth knowledge of the Android and iOS operating systems, who understands the settings of various hidden features that allow you to expand the capabilities of your smartphone, as well as get information about what is going on inside the phone for future repairs. He is an authority in his field, which has allowed him to become a ghostwriter for several technology publications, and he enjoys writing small mobile applications for testing smartphones.