Flash firmware on LG K21
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How to flash LG K21?
Why reinstall the firmware?
Errors in the Android OS start to appear regularly.
Some installed applications stop opening.
Some applications 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 phone manufacturer's website.
On sites 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 an SD card into the gadget. It must have enough memory for 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. And place it on the SD card.
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.
Going to the next screen, select the item 'TWRP FLASH' and provide the application with 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.
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'.
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 firmware and other necessary files to the SD card.
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, it is recommended to clear the 'Cache' and 'Data' sections. This will delete all user data from the device, but avoid a wide range of software errors and other problems. You must press 'WIPE' on the main screen.
Now you can start flashing. Click the 'Install' button.
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.
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, accompanied by logging and filling in the progress bar.
When the procedure for installing the firmware is completed, the message 'Successful' appears on the screen.
Summary: Smart Phone OS: Android v9.0 (Pie); CPU: Octa core, 2 GHz, Cortex A53; Chipset: MediaTek Helio P22; Architecture: 64 bit; GPU: PowerVR GE8320; RAM: 3 GB; Screen Size: 5.7 inches (14.48 cm); Screen Resolution: 720 x 1440 pixels; Aspect Ratio: 18:9; Display Type: IPS LCD; Display dots per inch: 282 ppi; Touch Screen: Yes, Capacitive Touchscreen, Multi-touch; Bezel-less display: Yes; Internal Memory: 32 GB; Expandable Memory: Yes, Up to 1 TB; SIM 1: 4G Bands: TD-LTE 2300(band 40)FD-LTE 1800(band 3) 3G Bands: UMTS 1900 / 2100 / 850 / 900 MHz 2G Bands: GSM 1800 / 1900 / 850 / 900 MHzGPRS: Available EDGE: Available; SIM 2: 4G Bands: TD-LTE 2300(band 40)FD-LTE 1800(band 3) 3G Bands: UMTS 1900 ...
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