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Flash firmware on Verykool LEO II S4003

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How to flash Verykool LEO II S4003?


Why reinstall the firmware?

Errors start to appear in the operating system.

Some installed applications do not open.

Many programs from the Play Market do not start.

The phone restarts or shuts down randomly.

The phone slows down a lot during operation.

The OS does not match the system requirements of the smartphone.





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?

Create a backup copy of user data, contacts and photos and transfer it to your computer.

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

Find information about 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

Install the Official TWRP App from the Play Store on your phone.

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.

After moving to the next screen, you need to select the 'TWRP FLASH' item and give the application root rights.

TWRP

On the main screen of the application, select 'Select Device', and find 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.

Press the 'FLASH TO RECOVERY' button and confirm your choice.

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.

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 your 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. We open the menu, 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, 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.

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


TWRP

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.



TWRP

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.

The completion of the firmware installation procedure is indicated by the inscription 'Successful'.





Summary: Colors: Blue; Dimensions: 122 x 64 x 10 mm, Exactly 122 x 63 x 10.7 mm; Weight: 112g; Type: LCD capacitive touchscreen; Display Colors: 16M Colors; Size: 4 Inch; Resolution: 480 x 800 pixels; Pixel Density: 201 to 275 ppi, (~233 ppi Pixel Density); Primary: 5.0 Megapixels, 2592 x 1944 Pixels; Flash: Yes; Secondary: 1.3 Megapixels; Audio Playback: WAV, AAC , OGG, FLAC, MIDI, WMA, MP3, AMR, AAC, eAAC; Ring Tones: Vibration, MP3 ringtones, MIDI, WAV; FM Radio: Yes; 3.5mm jack: Yes; Operating System: Android 4.4 KitKat; Chipset: MediaTek, MT6572M; CPU: 1.3 GHz Dual Core Processor; GPU: Mali 400; RAM: 512 MB; Internal Storage: 4 GB; Card Slot: MicroSD Upto 32 GB; Sensors: Ac ...

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