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Flash firmware on LG Leon 4G LTE H340N

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How to flash LG Leon 4G LTE H340N?


Why reinstall the firmware?

Errors in the Android OS start to appear regularly.

Some installed applications stop opening.

Some programs from the Play Market do not start.

The phone turns off for no apparent reason.

The phone began to slow down a lot.

You want to update the firmware, as it does not suit you in terms of functionality.





Where can I find the firmware?

On the official website of the phone manufacturer.

On sites where third-party developers and phone manufacturers 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 an SD card into your phone to write the firmware to it.

Find information about 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

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

When you start the application for the first time, you need to give consent to future manipulations, as well as to give consent to granting the application Superuser rights and click the 'OK' button.

On the next screen, select 'TWRP FLASH' and give the application root rights.

TWRP

On the main screen of the application, click 'Select Device', and find 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. 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'.

When 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 enter the menu accessible by pressing the button with three stripes in the upper left corner of the main screen of the application. Select the 'Reboot' item, and then click 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.

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


TWRP

The file selection screen appears. At the very top is the 'Storage' button, select the location where the firmware file is located.

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, you need to check the item 'Zip signature verification', which will avoid using damaged files during recording.

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.

When the procedure for installing the firmware is completed, the message 'Successful' appears on the screen.





Summary: Design: Classic; SIM cards standard: Mini Sim - Regular; GSM: 850 900 1800 1900; HSDPA: 900 1900 2100 HSPA; LTE: 800 900 1800 2100 2600; Dimensions (H/L/W): 129.9 x 64.9 x 10.9 mm, vol. 91 cm³; Display: LCD IPSColor (16M) 480x854px (4.5") 218ppi; Touch screen: yes; Weight: 139 g; Time GSM (talk/stand-by): 4 / 100 hrs. (4.2d); Battery: Li-Ion 1900 mAh; Built-in memory: 8 GB; Memory card: MicroSD max. 32 GB; RAM memory: 1 GB; Operating system: Android 5.0; Chipset: Qualcomm MSM8926; CPU 1 frequency: 1200.0 MHz(4-core); GPRS: yes; EDGE: yes; HSDPA: 21 Mb/s; HSUPA speed: 5,76 Mb/s; HSCSD: no; Wi-Fi: 802.11 b/g/n; Bluetooth: 4.1; USB: 2.0; IrDA: no; WAP: 2.0; XH ...

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