You are not satisfied with the possibilities of the stock firmware.
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 SD card. 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.
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 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 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.
When the message 'Flash Completed Succsessfuly!' appears. Click 'OK'. The TWRP installation procedure is now 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 enter the menu accessible by pressing the button with three stripes in the upper left corner of the main screen of the application. Select 'Reboot' 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.
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. 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 flashing the phone will begin, accompanied by the appearance of inscriptions in the log field and the movement of the progress bar.
After the firmware installation procedure is completed, the 'Successful' message appears on the screen.
Summary: OS version: Android 5.1; CPU: MediaTek MT6580, 1300 MHz; Processor cores number: 4; RAM: 1 GB; Built-in memory: 8 GB; Video processor: Mali-400 MP2; Memory card slot: yes, volume of up to 32 GB; Multi SIM mode: alternate; SIM-card amount: 2; SIM-card type: regular micro SIM; Case type: classic; Height: 165 mm; Width: 83.6 mm; Thickness: 8.1 mm; Diagonal: 6"; Screen type: colored IPS, sensor; Sensor screen type: multitouch, capacitive; Screen size: 960x540; Sensors: illumination sensor, approaching sensor; Camera: 5 megapixels; Front camera: 2 megapixels; Video Recording: yes; Standard: GSM 900/1800/1900, 3G; Interfaces: Wi-Fi, Bluetooth 4.0, USB; A-GPS system: yes; Audio: MP3, FM-radio; Hea ...
Comments, questions and answers on the flash firmware Merlin NeoPhab