Flash firmware on Micromax Q421
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How to flash Micromax Q421?
Why reinstall the firmware?
Errors begin to appear in the Android operating system.
Some applications stop opening.
Some programs from the Play Market do not start.
The phone restarts by itself for no reason.
The phone is slow.
You are not satisfied with the functionality of the stock firmware.
Where can I find the firmware?
On the official website of the manufacturer.
On sites where third-party developers and phone manufacturers 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.
Fully charge your device's battery.
Find and download the archive with Firmware. Place it on the SD card.
Installing TWRP Recovery
Install the Official TWRP App from the Play Store on your phone. And run this application.
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.
In the next screen, select the item 'TWRP FLASH' and provide the application with root-rights.
On the main screen of the application, the 'Select Device' drop-down list is available, in which you need to find and select the device model for installing the recovery.
After selecting the phone, the application will redirect the user to a web page to download the modified recovery environment image file. Download the proposed *.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.
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..
Copy the firmware and other necessary files to the SD card.
Insert a SD memory card into the phone.
To reboot in recovery, it is convenient 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. We open the menu, select the 'Reboot' item, and then tap on the 'REBOOT RECOVERY' button. The phone will reboot into the recovery environment automatically.
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.
Everything is ready to start flashing. Press the 'Install' button.
The file selection screen is displayed. At the very top is the 'Storage' button, select the location where the firmware file is located.
Select the location where the files were copied. 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.
The completion of the installation procedure is indicated by the inscription 'Successful'.
Summary: OS version: Android 6.0; CPU: MediaTek MT6737, 1300 MHz; Processor cores number: 4; RAM: 1 GB; Built-in memory: 8 GB; Video processor: Mali-T720 MP2; Memory card slot: yes, volume of up to 32 GB; Multi SIM mode: alternate; SIM-card amount: 2; SIM-card type: micro SIM; Case type: classic; Case material: plastic; Height: 145 mm; Width: 72 mm; Thickness: 9.4 mm; Weight: 150 grams; Diagonal: 5"; Screen type: colored, sensor; Sensor screen type: multitouch, capacitive; Screen size: 1280x720; Number of pixels per inch (PPI): 294; Aspect Ratio: 16:9; Rear camera: 5 MP; Flash: rear, LED; Rear camera functions: autofocus; Front camera: 2 megapixels; Video Recording: yes; Standard: GSM 900/1800/1900, ...
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