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Flash firmware on Verykool Leo LTE SL4050

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How to flash Verykool Leo LTE SL4050?


Why reinstall the firmware?

Errors constantly appear in the Android OS.

Apps won't open.

Many applications from the Play Market do not start.

The phone restarts or shuts down for no reason.

The phone slows down a lot during operation.

You are not satisfied with the possibilities of the stock firmware.





Where can I find the firmware?

On the website of your phone manufacturer.

On specialized services on which various developers lay out custom or official OS.


What should be done before installing the firmware?

Create a backup copy of user data and transfer it to another medium.

Insert your SD card into your phone. It must have enough memory to fit the firmware.

Determine your smartphone model.

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

Download Firmware and Place it on the SD card.





Installing TWRP Recovery

Download the Official TWRP App from the Play Market. Download, install and launch the application..

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.

On 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, click 'Select Device', 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.

When the file is loaded, you need to 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 that you are ready to start the procedure - press '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.

Transfer the firmware and other necessary files to the SD card.

Insert a memory card into the device.

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 'Reboot' and then click on the 'REBOOT RECOVERY' button.





Firmware via TWRP

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.

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 storage to which the files were copied. Press the OK button.



TWRP

Find the file we need 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.

After the firmware installation procedure is completed, the 'Successful' message appears on the screen.





Summary: Design: Classic; DualSIM mode: yes; SIM cards standard: Mini Sim - Regular; GSM: 850 900 1800 1900; HSDPA: 850 1900 HSPA; LTE: 700 850 1900 2100 2600; Dimensions (H/L/W): 127 x 63.5 x 9.9 mm, vol. 79 cm³; Display: TFTColor (16M) 480x800px (4.0") 233ppi; Touch screen: yes; Weight: 114 g; Time GSM (talk/stand-by): 4 / 200 hrs. (8.3d); Battery: Li-Ion 1400 mAh; Built-in memory: 8 GB; Memory card: MicroSD; RAM memory: 1 GB; Operating system: Android 5.1; Chipset: MediaTek MT6735M; CPU 1 frequency: 1000.0 MHz(4-core); GPU Type: ARM Mali-T720 MP2; GPU frequency: 500.0 MHz(2-core); GPRS: yes; EDGE: yes; HSDPA: 42 Mb/s; HSUPA speed: 11,5 Mb/s; HSCSD: no; Wi-Fi: 802.1 ...

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