Flash firmware on LG U F820L
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How to flash LG U F820L?
Why reinstall the firmware?
Errors in the Android OS start to appear regularly.
Some installed applications stop opening.
Many programs from the Play Market do not start.
The phone restarts or shuts down by itself.
The phone slows down a lot during operation.
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 specialized services where users post custom or official OS.
What should be done before installing the firmware?
Create a backup copy of all personal information: contacts, photos and transfer it to another computer.
Insert your SD card into your phone. It must have enough memory to fit the firmware.
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.
Installing TWRP Recovery
Download the Official TWRP App to your phone from the Play Market. And install this app.
At the first start, you need to give consent to future manipulations, as well as consent to granting the Superuser rights to the application. Check the checkboxes and press the 'OK' button.
On the next screen, select 'TWRP FLASH' and give the application root rights.
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.
When the file is loaded, you need to 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.
Now press the 'FLASH TO RECOVERY' button and confirm your choice, press 'OK'.
The recording process is very fast, and upon completion, the message 'Flash Completed Succsessfuly!' appears. Click 'OK'. The TWRP installation procedure can be considered complete.
Copy the required files to the memory card. Using a PC or laptop card reader.
Insert a SD memory card into the phone.
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
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.
Now you can start flashing. Click the 'Install' button.
The file selection screen appears. At the very top is the 'Storage' button, select the location where the firmware file is located.
Select the storage to which the files were copied.
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.
When the procedure for installing the firmware is completed, the message 'Successful' appears on the screen.
Summary: Design: Classic; SIM cards standard: Nano Sim; GSM: 850 900 1800 1900; HSDPA: 2100 HSPA; LTE: 850 900 1800 2100; Dimensions (H/L/W): 147.5 x 73.2 x 6.9 mm, vol. 74.5 cm³; Display: LCD IPSColor (16M) 1080x1920px (5.2") 424ppi; Touch screen: yes; Weight: 118 g; Time GSM (talk/stand-by): 11 / 560 hrs. (23.3d); Battery: Li-Ion 3000 mAh; Non-removable battery: yes; Built-in memory: 32 GB; Memory card: MicroSD; RAM memory: 2 GB; Operating system: Android 6.0; Chipset: MediaTek MT6753; CPU 1: ARM Cortex A53; CPU 1 frequency: 1140.0 MHz(8-core); GPU Type: ARM Mali-T720 MP3; GPU frequency: 450.0 MHz(3-core); GPRS: yes; EDGE: yes; HSDPA: 42 Mb/s; HSUPA speed: 5,76 Mb/s; ...
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