Errors periodically appear in the Android operating system.
Some installed applications stop opening.
Many programs from the Play Market do not start.
The phone restarts for no reason.
The phone is slow.
You have decided to try a different version of Android.
Where can I find the firmware?
On the phone manufacturer's website.
On specialized services on which developers lay out custom or official OS.
What should be done before installing the firmware?
Back up your phone's user data.
Insert an SD card into your phone to write the firmware to it.
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.
Download the archive with Firmware and place it on the SD card.
Installing TWRP Recovery
Download the Official TWRP App from the Play Market. And install it.
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.
Going to the next screen, select the item 'TWRP FLASH' and provide the application with root-rights.
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.
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.
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..
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 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
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.
Press the 'Install' button to start the flashing.
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. 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 phone's memory will begin, this is accompanied by the appearance of inscriptions in the log field and the movement of the progress bar.
After completing the installation procedure, a 'Successful' message appears on the screen.
Summary: Size: 77.2 mm x 156.5 mm x 10.8 mm; Aspect Ratio: 16: 9; Weight: 170 g; Usable surface: 69 %; Materials: Plastic; Colors: Blue Gold Gray Pink Red White; Origami: Print 3D Model; Diagonal: 5.5"; Screen Type: LCD IPS; Screen Resolution: 1080 x 1920 px (FHD); Density: Very high density, 401 Pixels per inch differentiable less than 5 cm away; Others: Anti-fingerprint coating, Capacitive, Corning Gorilla Glass 4, Multi-touch, Scratch resistant; Operating System: Android 5.0 Lollipop; Model: Qualcomm Snapdragon 615 MSM8939; CPU: Cortex A53; Type: Octa-Core; Frequency: 1.7 GHz; 64 Bits: Yes; GPU: Qualcomm Adreno 405; RAM: 3 GB; Antutu score: 39.483 Overall performance better t ...
Comments, questions and answers on the flash firmware Asus ZenFone Selfie ZD551KL CN
Ask a question about Asus ZenFone Selfie ZD551KL CN