Flash firmware on LG K40S
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How to flash LG K40S?
Why reinstall the firmware?
Errors start to appear in the operating system.
Some applications do not open, reinstalling which does not lead to a positive result.
Some applications from the Play Market do not start.
The phone turns off for no apparent reason.
The phone slows down a lot during operation.
The OS does not match the system requirements of the smartphone.
Where can I find the firmware?
On the 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 information about your smartphone model.
Fully charge your device.
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.
On the next screen, you need to select the 'TWRP FLASH' item and give the application root-rights.
On the main screen of the application, select 'Select Device', and find your phone model.
After selecting a phone, the application will direct the user to a web page to download the modified recovery environment image file. Download the proposed *.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.
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 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 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 is displayed. At the very top is the 'Storage' button, which allows you to switch between types of memory.
Select the location where the files were copied.
Find the file we need 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 corrupted files when writing to the phone's memory sections.
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.
The completion of the firmware installation procedure is indicated by the inscription 'Successful'.
Summary: Smart Phone OS: Android 9.0 (Pie); Chipset: Mediatek MT6762 Helio P22 (12 nm); CPU: Octa-core 2.0 GHz Cortex-A53; GPU: PowerVR GE8320; Type: IPS LCD capacitive touchscreen, 16M colors; Screen Size: 6.1 inches, 92.9 cm2 (~80.4% screen-to-body ratio); Resolution: 720 x 1520 pixels, 19: 9 ratio (~276 ppi density); Card slot: microSD, up to 1 TB (dedicated slot); Internal: 32GB 2GB RAM, 32GB 3GB RAM; Loudspeaker: Yes; 3.5mm jack: Yes; : DTS: X Surround SoundActive noise cancellation with dedicated mic; WLAN: Wi-Fi 802.11 a/b/g/n/ac, dual-band, Wi-Fi Direct, DLNA, hotspot; Bluetooth: 5.0, A2DP, LE; GPS: Yes, with A-GPS, GLONASS; NFC: Yes (market/region dependent); Radio: No; ...
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