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Flash firmware on Samsung Galaxy J2 Core

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How to flash Samsung Galaxy J2 Core?


Why reinstall the firmware?

Errors periodically appear in the Android operating system.

Some installed applications do not open.

Some applications from the Play Market do not start.

The phone turns off for no apparent reason.

The phone is slow.

You have decided to try a different version of Android.





Where can I find the firmware?

On the official website of your phone manufacturer.

On sites where users 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. It must have enough memory to fit the firmware.

Find out the exact model of your smartphone.

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

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





Installing TWRP Recovery

Install the Official TWRP App via the Play Market. And run this application.

When you start the application for the first time, you must consent to future manipulations, as well as consent to granting the application Superuser rights. Check the checkboxes and press the 'OK' button.

After moving to the next screen, you need to select the 'TWRP FLASH' item and give the application 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 application will direct the user to a web page to download the appropriate modified recovery environment image file. 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. Then we tell the program the path where the file loaded in the previous step is located.

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

After the burn process is complete, the message 'Flash Completed Succsessfuly!' appears. Click 'OK'. The TWRP installation procedure can be considered complete..

Copy the firmware and other necessary files to the SD card.

Insert a memory card into the device.

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 clear the 'Cache' and 'Data' sections, press 'WIPE' on the main screen. This will delete all user data from the device, but avoid a wide range of software errors and other problems.

Press the 'Install' button to start the flashing.


TWRP

On the file selection screen, at the very top there is a 'Storage' button for selecting an SD card.

Select the location where the files were copied.



TWRP

Select the firmware file 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 damaged files during recording.

The procedure for writing files to the device's memory will begin, accompanied by the appearance of inscriptions in the log field and the completion of the progress bar.

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





Summary: Quick charging: No; Operating system: Android v8.1 (Oreo); Sim slots: Dual SIM, GSM GSM; Custom ui: Android Go; Network: 4G: Available 3G: Available, 2G: Available; Display type: TFT; Aspect ratio: 16: 9; Screen to body ratio: 66.5 %; Pixel density: 220 ppi; Screen size: 5.0 inches (12.7 cm); Screen resolution: 540 x 960 pixels; Touch screen: Yes Capacitive Touchscreen, Multi-touch; Loudspeaker: Yes; Fm radio: Yes; Audio jack: 3.5 mm; Camera features: Digital Zoom, Auto Flash; Image resolution: 3264 x 2448 Pixels; Autofocus: No; Resolution: 5 MP Front Camera; Physical aperture: F2.2; Optical image stabilisation: No; Flash: No; Video recording: 1920x1080 @ 30 fps; Us ...

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