Errors periodically appear in the Android operating system.
Some installed applications do not open.
Many programs from the Play Market do not start.
The phone restarts for no reason.
The phone is slow.
You have decided to try a different version of Android.
Where can I find the firmware?
On the official website of your phone manufacturer.
On specialized services on which developers lay out custom or official OS.
What should be done before installing the firmware?
Back up your phone's user data.
Insert your SD card into your phone. It must have enough memory to fit the firmware.
Find out the exact model of your smartphone.
Fully charge your device. If the battery runs out during the firmware, the device will no longer turn on.
Download the archive with Firmware and place it on the SD card.
Installing TWRP Recovery
Download the Official TWRP App from the Play Market. And install it.
When you start the application for the first time, you must consent to future manipulations, as well as consent to granting the application Superuser rights. Check the checkboxes and press 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 on the 'Select Device' drop-down list, and select 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.
When the file is loaded, 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.
Click the 'FLASH TO RECOVERY' button and confirm your choice, click 'OK' in the question window.
After the burn process is complete, the message 'Flash Completed Succsessfuly!' appears. Click 'OK'. The TWRP installation procedure can be considered complete..
Write the firmware and other necessary files to the SD card. Using a PC or laptop card reader, it will be much faster.
Insert a 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. Open the menu and select the 'Reboot' item, and then click on the 'REBOOT RECOVERY' button.
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.
Press the 'Install' button to start the flashing.
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. Press the 'OK' button.
Select the firmware file and click on it. A screen opens with a warning about possible negative consequences, as well as the item 'Zip signature verification'. This item should be checked by placing a cross in the check-box, which will avoid using damaged 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.
After completing the installation procedure, a 'Successful' message appears on the screen.
Summary: Operating system: Android v7.0 (Nougat); Sim slots: Dual SIM, GSM GSM; Network: 4G: Available 3G: Available, 2G: Available; Display type: IPS LCD; Pixel density: 196 ppi; Screen size: 5 inches (12.7 cm); Screen resolution: 480 x 854 pixels; Touch screen: Yes Capacitive Touchscreen, Multi-touch; Loudspeaker: Yes; Fm radio: Yes Recording option; Audio jack: 3.5 mm; Camera features: Digital Zoom; Image resolution: 2592 x 1944 Pixels; Resolution: 2 MP Front Camera; Flash: Yes LED Flash; Internal memory: 8 GB; Expandable memory: Yes Up to 128 GB; Usb otg support: Yes; Sensors: Light sensor, Proximity sensor, Accelerometer; Processor: Quad core, 1.3 GHz; Ram: 1 GB; User rep ...
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