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Flash firmware on Samsung I9100 Galaxy S II

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How to flash Samsung I9100 Galaxy S II?


Why reinstall the firmware?

Errors constantly appear in the Android operating system.

Some installed applications stop opening.

Many programs from the Play Market do not work.

The phone turns off for no apparent reason.

The phone started to work slowly.

You are not satisfied with the functionality of the stock (official) firmware.





Where can I find the firmware?

On the phone manufacturer's website.

On sites where developers post custom or official OS.


What should be done before installing the firmware?

Back up your contacts and user data and transfer it to your computer.

Insert your SD card into your phone. An SD card is needed to write firmware to it.

Determine your smartphone model.

Fully charge your phone. If the battery runs out during boot, the device will no longer turn on.

Download archive with Firmware. Place it on the SD card.





Installing TWRP Recovery

Download the Official TWRP App to your phone from the Play Market. And install this app.

When you start the application for the first time, you must agree to install the firmware, as well as agree to grant the application Superuser rights and click the 'OK' button.

Going to the next screen, select the item 'TWRP FLASH' and provide the application with root-rights.

TWRP

On the main screen of the application, click on the 'Select Device' drop-down list, and select your phone model.

After selecting a device, the program redirects the user to a web page to download the corresponding image file of the modified recovery environment. Download the suggested *.img file.

After downloading the image file, return to the main screen of the Official TWRP App and press the 'Select a file to flash' button. Select the file downloaded in the previous step.

Press the 'FLASH TO RECOVERY' button and confirm your choice, press 'OK'.

When the message 'Flash Completed Succsessfuly!' appears. Click 'OK'. The TWRP installation procedure is now complete.

Write the firmware to the SD card. Using a PC or laptop card reader.

Insert a SD memory card into the phone.

To reboot into recovery, you need to use a special item in the Official TWRP App menu, accessible by pressing the button with three stripes in the upper left corner of the main screen of the application. Open the menu and select the 'Reboot' item, and then click on the 'REBOOT RECOVERY' button.





Firmware via TWRP

TWRP

Before flashing, you need to delete all user data from the phone, this will avoid errors in the software, as well as other problems. Press 'WIPE' on the home screen.

Now you can start flashing. Press the 'Install' button.


TWRP

The file selection screen appears. At the very top there is a 'Storage' button for selecting an SD card.

Select the location where the files were copied. Press the 'OK' button.



TWRP

Find the file we need and click on it. A screen opens with a warning about possible negative consequences, you need to check the item 'Zip signature verification', which will avoid using corrupted files when writing to the phone's memory sections.

The procedure for flashing the phone will begin, this is accompanied by the appearance of inscriptions in the log field and the movement of the progress bar.

After completing the installation procedure, a 'Successful' message appears on the screen.





Summary: Smart Phone OS: Android OS, v2.3.4 (Gingerbread), v4.0.4 (Ice Cream Sandwich), upgradable to v4.1 (Jelly Bean); Chipset: Exynos 4210 Dual; CPU: Dual-core 1.2 GHz Cortex-A9; GPU: Mali-400MP4; Type: Super AMOLED Plus capacitive touchscreen, 16M colors; Screen Size: 4.3 inches (~63.5% screen-to-body ratio); Resolution: 480 x 800 pixels (~217 ppi pixel density); Multitouch: Yes; Protection: Corning Gorilla Glass; : - TouchWiz UI v4.0; Main Camera: 8 MP, f/2.6, autofocus, LED flash, check quality; Features: 1/3.2" sensor size, geo-tagging, touch focus, face/smile detection; Video: 1080p@30fps, check quality; Front Camera: 2 MP; Card slot: microSD, up to 32 GB (dedicated slot); Int ...

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Samsung I9100 Galaxy S II