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Flash firmware on Itel A20

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How to flash Itel A20?


Why reinstall the firmware?

Errors periodically appear in the Android operating system.

Some installed applications stop opening.

Some programs from the Play Market do not start.

The phone restarts for no reason.

The phone slows down a lot during operation.

You have decided to try a different version of Android.





Where can I find the firmware?

On the phone manufacturer's website.

On specialized resources where users post custom or official OS.


What should be done before installing the firmware?

Back up your phone's user data.

Insert an SD card into the gadget. It must have enough memory for the firmware.

Find out the exact model of your smartphone.

Fully charge your phone. If the battery runs out during boot, the device will no longer turn on.

Find and download the archive with Firmware. Place it on the SD card.





Installing TWRP Recovery

Download the Official TWRP App from the Play Market. And install it.

At the first start, you need to give consent to future manipulations, as well as consent to granting the Superuser rights to the application. Check the checkboxes and press the 'OK' button.

Going to the next screen, select the item 'TWRP FLASH' and provide the application with root-rights.

TWRP

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 program redirects the user to a web page to download the corresponding image file of the modified recovery environment. 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. Select the file downloaded in the previous step.

Click the 'FLASH TO RECOVERY' button and confirm your choice, click 'OK' in the question window.

The recording process is very fast, and upon completion, the message 'Flash Completed Succsessfuly!' appears. Click 'OK'. The TWRP installation procedure can be considered complete.

Copy the required 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

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.


TWRP

The file selection screen appears. At the very top there is a 'Storage' button for selecting an SD card.

Select the location where you copied the files..



TWRP

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 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: Sim Type: GSM+GSM; Dual Sim: Yes; Sim Size: Mini + Micro SIM; Type: Color TFT screen; Touchscreen: Yes; Size: 4 inches, 480 x 800 pixels; PPI: ~ 233 PPI; RAM: 1 GB; Internal memory: 8 GB inbuilt; Card Slot: Yes, upto 32 GB; GPRS: Yes; EDGE: Yes; 3G: Yes; 4G: Yes; VoLTE: Yes (Supports Reliance Jio); Wi-Fi: Yes, with wifi-hotspot; Bluetooth: Yes, v4.0; USB: Yes, microUSB v2.0; GPS: Yes, with A-GPS Support; Sensors: Accelerometer; 3.5mm Headphone Jack: Yes; Camera: Yes, 2 MP; Dual Camera: No; Flash: LED; Front Camera: Yes, VGA (0.3 MP); Operating System: Android, v7.0 (Nougat); Processor: 1.3 GHz, Quad Core Processor; Size: 1700 mAh, Li-ion Battery; Standby time: 7.5 ...

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