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Flash firmware on Samsung DoubleTime I857

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How to flash Samsung DoubleTime I857?


Why reinstall the firmware?

Errors constantly appear in the Android operating system.

Some installed applications stop opening.

Some programs from the Play Market do not start.

The phone restarts or shuts down randomly.

The phone began 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 specialized resources where users post custom or official OS.


What should be done before installing the firmware?

Create a backup copy of user data, contacts and photos and transfer it to your computer.

Insert SD card. 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.

Find and download the archive with Firmware. Place it on the SD card.





Installing TWRP Recovery

Download and install the Official TWRP App from the Play Market.

When you start the application for the first time, you must agree to install a new firmware and all the risks associated with this, 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, go 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 on the screen. Click the 'OK' button. The TWRP installation procedure is now complete.

Copy the required files to the SD card. Using a PC or laptop card reader, it will be much faster.

Insert a memory card into your 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 many 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 you copied the files..



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, 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, v2.2 (Froyo); Chipset: Qualcomm MSM7230; CPU: 800 MHz Scorpion; GPU: Adreno 205; Type: TFT capacitive touchscreen, 256K colors; Screen Size: 3.2 inches (~43.5% screen-to-body ratio); Resolution: 320 x 480 pixels (~180 ppi pixel density); Multitouch: Yes; : - Secondary TFT capacitive touchscreen (with multitouch), 320 x 480 pixels, 3.2 inches, - TouchWiz UI; Main Camera: 3.15 MP, autofocus; Features: Geo-tagging; Video: 320p; Front Camera: No; Card slot: microSD, up to 32 GB (dedicated slot); Internal: 260 MB, 256 MB RAM; Alert types: Vibration; MP3, WAV ringtones; Loudspeaker: Yes; 3.5mm jack: Yes; WLAN: No; Bluetooth: v3.0, A2DP; GPS: Yes, wi ...

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