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Flash firmware on Asus ZenFone 3 Deluxe S821

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How to flash Asus ZenFone 3 Deluxe S821?


Why reinstall the firmware?

Errors in the Android OS start to appear regularly.

Some applications will not open.

Some applications from the Play Market do not start.

The phone restarts by itself for no reason.

The phone started to work slowly.

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 manufacturer.

On certain sites where developers 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 SD card. An SD card is needed to write firmware to it.

Find information about your smartphone model.

Charge your phone fully. If the battery runs out during boot, the device will no longer turn on. It will be difficult to restore it.

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





Installing TWRP Recovery

Install the Official TWRP App via the Play Market. And run this application.

When you start the application for the first time, you must agree to install the firmware, as well as agree to grant the application Superuser rights and click the 'OK' button.

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

TWRP

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

After downloading the image file, return 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.

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

When the message 'Flash Completed Succsessfuly!' appears. Click 'OK'. The TWRP installation procedure is now complete.

Transfer the necessary files to the SD card. Using a PC or laptop card reader.

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 delete all user data from the phone, this will avoid many problems. press 'WIPE' on the home screen.

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


TWRP

The file selection screen is displayed. At the very top is the 'Storage' button, which allows you to switch between types of memory.

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 flashing the phone will begin, 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: Chip: Qualcomm Snapdragon 821 MSM8996 Pro; Process technology: 14 nm; CPU: 2x 2.4 GHz Kryo, 2x 2.0 GHz Kryo; CPU bits: 64 bit; Instruction set: ARMv8-A; Level 2 cache memory (L2): 1536 KB; CPU cores: 4; CPU frequency: 2400 MHz; GPU: Qualcomm Adreno 530; GPU frequency: 653 MHz; RAM capacity: 6 GB; RAM type: LPDDR4; RAM channels: Double channel; RAM frequency: 1866 MHz; Operating system (OS): Android 6.0.1 Marshmallow; User interface (UI): ZenUI 3.0; SIM card type: Nano-SIM (4FF - fourth form factor, since 2012, 12.30 x 8.80 x 0.67 mm)Micro-SIM / microSD; Number of SIM cards: 2, SIM1 - 2G; 3G; 4GSIM2 - 2G; 3G; 4G; Type/technology: Super AMOLED; Diagonal size: 5.7 in; Width: ...

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