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Flash firmware on Vitu Cro3

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How to flash Vitu Cro3?


Why reinstall the firmware?

Errors in the Android OS start to appear regularly.

Some applications do not open, reinstalling which does not lead to a positive result.

Some applications from the Play Market do not start.

The phone restarts by itself for no reason.

The phone is slow.

You want to update the firmware, as it does not suit you in terms of functionality.





Where can I find the firmware?

On the official website 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 user data and transfer it to your computer.

Insert an SD card into your phone to write the firmware to it.

Find information about your smartphone model.

Fully charge your phone battery.

Find and download the archive with Firmware. And 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.

On the next screen, select 'TWRP FLASH' and give the application root rights.

TWRP

On the main screen of the application, click 'Select Device', and find your phone model.

After selecting a phone, the application will direct 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 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 the 'Reboot' item, and then click on the 'REBOOT RECOVERY' button. The phone will reboot into the recovery environment automatically..





Firmware via TWRP

TWRP

Before flashing, you need to clear the 'Cache' and 'Data' sections, press 'WIPE' on the main screen. You will delete all user data from the phone, this will avoid software errors and other problems.

Now you can start flashing. Click the 'Install' button.


TWRP

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.



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, this is accompanied by the appearance of inscriptions in the log field and the movement of the progress bar.

When the procedure for installing the firmware is completed, the message 'Successful' appears on the screen.





Summary: OS: Android 8.1 Oreo; RAM Memory: 3 GB; Display: LCD IPS Color (16M) (6.26"); Touch screen: yes; Built-in memory: 32 GB; Camera: yes; Flash: LED; Autofocus: yes; Optical zoom: no; Digital zoom: yes; Second camera: yes; Bluetooth: 5.0; NFC: yes; EDGE: yes; GPRS: yes; GPS: yes; A-GPS: yes; BeiDou: yes; Glonass: yes; LTE: yes; GSM: 850 900 1800 1900; HSDPA: HSPA; USB: 2.0; WAP: 2.0; Wi-Fi: yes; Audio out: Jack 3,5 mm; Games: yes; MP3 player: yes; MP3 ringtones: yes; Polyphony: yes; Radio: yes; RDS: yes; RSS: yes; Vibra: yes; Dictaphone: yes; Loudspeaker: yes; Voice dialing: yes; Accelerometer: yes; Fingerprint sensor: yes; Light sensor: yes; Proximity sensor: yes; Dual SIM: yes; SIM card size: ...

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