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Flash firmware on LG F540L

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How to flash LG F540L?


Why reinstall the firmware?

Errors begin to appear in the Android OS.

Some installed applications stop opening.

Many programs from the Play Market do not work.

The phone restarts for no reason.

The phone is slow.

You are not satisfied with the functionality of the stock 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 phone's user data.

Insert an SD card into your phone to write the firmware to it.

Remember 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 from the Play Market. And install it.

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.

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, the 'Select Device' drop-down list is available, in which you need to find and select the device model for installing the recovery.

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.

Click the 'FLASH TO RECOVERY' button and confirm your choice, click 'OK' in the question window.

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

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

Insert a memory card into the phone.

To reboot in recovery, it is convenient 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. We open the menu, select the 'Reboot' item, and then tap on the 'REBOOT RECOVERY' button. The phone will reboot into the recovery environment automatically.





Firmware via TWRP

TWRP

Before flashing, you need to clear the 'Cache' and 'Data' sections, press 'WIPE' on the main screen. You will delete all user data from the phone, this will avoid software errors and other problems.

Everything is ready to 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

Select the firmware file and click on it. A screen opens with a warning about possible negative consequences, as well as the item 'Zip signature verification'. This item should be checked by placing a cross in the check-box, which will avoid using damaged files when writing to the phone's memory sections.

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

The completion of the installation procedure is indicated by the inscription 'Successful'.





Summary: Aliases: LG Volt LTE, LG C70; Type: Mobile; Battery: Li-Ion 2100 mAh; CPU: Qualcomm MSM8916 Snapdragon 410, Quad Core 1.2GHz, ARM Cortex A53, Adreno 306; Eusar: 0.78 Head; Smart Phone OS: Android 5.0; Dimensions: 66.1 x 133.3 x 9.9 mm; Formfactor: Bar; Keyboard: Screen; Sidekeys: Volume, Power; Softkeys: 3; Weight: 119 g; Color: Yes; Colors: 16.7M; Other: Capacitive Touchscreen, Multitouch, Corning Gorilla Glass 2; Pixel aspect ratio: 2.00; Resolution: 360x640; Display PPI: 312; Screen Size: 4.7; Type: IPS TFT; Audio: AAC, AMR, 3GA, AMR-NB, eAAC+, HE-AACv2, MIDI, MP3, WMA, WAV; Camera: 8MP, 3264x2448; Other: Geo-Tagging, CMOS Sensor, AutoFocus, 1x Optical Zoom, LED ...

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