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Flash firmware on Asus MeMO Pad 8 AST21

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How to flash Asus MeMO Pad 8 AST21?


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 shuts down and restarts for no apparent reason.

The phone began 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?

Back up your contacts and user data and transfer it to another medium.

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

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

Download the Official TWRP App to your phone from the Play Market. And install this app.

When you start the application for the first time, you must agree to install a new firmware and all the risks associated with this, 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.

After adding the image file to the program, click the 'FLASH TO RECOVERY' button and confirm your choice, click 'OK'.

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

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

Insert a 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, 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

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

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 phone's memory will begin, accompanied by logging and filling in the progress bar.

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





Summary: Chip: Intel Atom Z3580; Process technology: 22 nm; CPU: Intel Silvermont; CPU bits: 64 bit; Instruction set: IA-32 (x86), IA-64 (x64); Level 1 cache memory (L1): 24 KB + 32 KB; Level 2 cache memory (L2): 2048 KB; CPU cores: 4; CPU frequency: 2300 MHz; GPU: PowerVR G6430 MP4; GPU cores: 4; GPU frequency: 533 MHz; RAM capacity: 2 GB; RAM type: LPDDR3-1600; RAM channels: Double channel; RAM frequency: 800 MHz; Operating system (OS): Android 4.4.2 KitKat; Number of SIM cards: 1; Type/technology: IPS; Diagonal size: 8 in; Width: 6.97 in; Height: 3.92 in; Aspect ratio: 1.77816: 9; Resolution: 1920 x 1080 pixels; Pixel density: 275 ppi; Color depth: 24 bit16777216 colors; ...

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