Flash firmware on NUU Mobile A3
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How to flash NUU Mobile A3?
Why reinstall the firmware?
Errors periodically appear in the Android operating system.
Some applications will not open.
Some applications from the Play Market do not start.
The phone restarts by itself for no reason.
The phone began to work slowly.
You have decided to try a different version of Android.
Where can I find the firmware?
On the official website of the manufacturer.
On certain sites where developers post custom or official OS.
What should be done before installing the firmware?
Create a backup copy of 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 out the exact model of your smartphone.
Charge your phone fully. If the battery runs out during boot, the device will no longer turn on. It will be difficult to restore it.
Find and download the archive with Firmware. And place it on the SD card.
Installing TWRP Recovery
Install the Official TWRP App via the Play Market. And run this application.
When you start the application for the first time, you must agree to install a new firmware and all the risks associated with this, as well as agree to grant the application Superuser rights and click the 'OK' button.
In the next screen, select the item 'TWRP FLASH' 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 the phone, the program will redirect the user to a web page to download the corresponding image file of the modified recovery environment. Download the proposed *.img file.
After downloading the image file, return 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.
When the message 'Flash Completed Succsessfuly!' appears on the screen. Click the 'OK' button. The TWRP installation procedure is now complete.
Transfer the necessary files to the SD card. Using a PC or laptop card reader.
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, it is recommended to clear the 'Cache' and 'Data' sections. This will delete all user data from the device, but avoid a wide range of software errors and other problems. You must press 'WIPE' on the main screen.
Press the 'Install' button to start the flashing.
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 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, 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 phone's memory will begin, accompanied by logging and filling in the progress bar.
After completing the installation procedure, a 'Successful' message appears on the screen.
Summary: Operating system: Android 6.0 Marshmallow; Chipset: MediaTek MT6580; CPU: ARM Cortex-A7, 1.3 GHz, cores: 4; GPU: ARM Mali-400 MP2; Sensors: Proximity,Light,Accelerometer; Messaging: SMS(threaded view), MMS, Email, Push Mail, IM; Browser: HTML,HTML5,CSS 3; Radio: Yes; GPS: GPS, A-GPS; Java: -; Colors: Gold,Gray; More feature: -; Display size: 5 inches, 480 x 854 pixels, (~196 ppi); Display type: TFT Touch Capacitive Screen; Multitouch: Yes; Memory card: MicroSD, microSDHC; Memory internal: 8 GB, 1 GB RAM; GPRS: Yes; EDGE: Yes; Bluetooth: 4.0; USB: 2.0, Micro USB; WLAN: b, g, n, Wi-Fi Hotspot; Speed: -; NFC: No; Infra red: No; Rear camera: 2592 x 1944 pixels,5.04 MP; ...
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