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 your phone manufacturer.
On specialized resources 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. An SD card is needed to write firmware to it.
Determine your smartphone model.
Fully charge your device. If the battery runs out during the firmware, the device will no longer turn on.
Find and download the archive with Firmware. 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.
When you start the application for the first time, you must agree to install the firmware, as well as agree to grant the application Superuser rights and click the 'OK' button.
After moving to the next screen, you need to select the 'TWRP FLASH' item 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 application will direct the user to a web page to download the appropriate modified recovery environment image file. 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. Select the file downloaded in the previous step.
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 is now complete.
Copy the required files to the SD card. Using a PC or laptop card reader, it will be much faster.
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 delete all user data from the phone, this will avoid errors in the software, as well as other problems. Press 'WIPE' on the home screen.
You can start flashing. Click the 'Install' button.
On the file selection screen, at the very top there is a 'Storage' button for selecting an SD card.
Select the location where you copied the files..
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 flashing the phone 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: OS: Android v9.0 (Pie); Chipset: Qualcomm Snapdragon 630; CPU: Octa core (2.2 GHz, Quad core, Cortex A53 1.8 GHz, Quad core, Cortex A53); Architecture: 64 bit; RAM: 4 GB; GPU: Adreno 508; Screen Size: 5.5 inches; Screen Resolution: 1080 x 2160 pixels; Screen type: HD IGZO LCD; Pixel density: 439 ppi; Aspect ratio: 18:9; Screen to body ratio calculated: 75.86 %; Bezelless display: Yes; Internal memory: 64 GB; Expandable memory: Yes Up to 256 GB; Front camera: 8 MP; Main camera: 12 MP 12 MP; Resolution: 8 MP Front Camera; Flash: Yes LED Flash; Image resolution: 4000 x 3000 Pixels; Autofocus: Yes; Physical aperture: F2.2; Shooting modes: Continuos Shooting, High Dynamic Range mode (HDR); Senso ...
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