Errors periodically appear in the Android operating system.
Some installed applications do not open.
Some applications from the Play Market do not start.
The phone restarts or shuts down by itself.
The phone started to work slowly.
You have decided to try a different version of Android.
Where can I find the firmware?
On the official Internet resource of the phone manufacturer.
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 SD card. An SD card is needed to write firmware to it.
Find out the exact model of your smartphone.
Fully charge your phone battery.
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.
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, select the 'TWRP FLASH' item and provide the application with 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.
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'.
When the message 'Flash Completed Succsessfuly!' appears. Click 'OK'. The TWRP installation procedure is now 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. Open the menu and select the 'Reboot' item, and then click on the 'REBOOT RECOVERY' button.
Firmware via TWRP
Before flashing, you need to delete all user data from the phone, this will avoid many problems. press 'WIPE' on the home screen.
Press the 'Install' button to start the flashing.
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 flashing the phone will begin, accompanied by the appearance of inscriptions in the log field and the movement of the progress bar.
After completing the installation procedure, a 'Successful' message appears on the screen.
Summary: OS version: Android 5.1; CPU: Qualcomm Snapdragon 210 MSM8909, 1100 MHz; Processor cores number: 4; RAM: 1 GB; Built-in memory: 8 GB; Video processor: Adreno 304; Memory card slot: yes, volume of up to 32 GB; SIM-card amount: 1; SIM-card type: nano SIM; Case type: clamshell; Construction: waterproof, shockproof case; Height: 113 mm; Width: 51 mm; Thickness: 16.7 mm; Weight: 132 grams; Diagonal: 3.4"; Screen type: colored TFT, 16.78 mln colors; Screen size: 960x540; Number of pixels per inch (PPI): 324; Aspect Ratio: 16:9; Additional screen: yes, 0.9", 36x128 px; Rear camera: 8 MP; Video Recording: yes; Standard: GSM 900/1800/1900, 3G, 4G LTE; Interfaces: Wi-Fi 802.11n, Bluetooth 4.1, IRDA, ...
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