How to update the BIOS of ASUS UX21E series under Windows system is as follows:

　A .Please confirm the correct model of your laptop first, and go to the download area of ​​ASUS official website to download the latest version of the BIOS file for that model.

B. Please confirm that the Winflash BIOS update program is installed in the laptop. You can go to the download area of ​​the ASUS official website to obtain the latest version of the update program.

C. Before updating, please close all other running programs and save your active files. If necessary, you can temporarily turn off the anti-virus software.

D. Please go to Start Menu->All Programs>ASUS Utility and click Win Flash. (If the User Account Control prompt window appears, please click Yes)

E. When the introduction message appears, please click "OK".

F. Please select and open the downloaded and decompressed BIOS file, which has a three-digit extension.

G. Please confirm whether the BIOS version and model information displayed on the main screen are correct. If the BIOS file is correct and can be updated, the message will display "The BIOS image file format is correct. You can press [Flash] button to upgrade BIOS ROM".

H. Please click the [Flash] button and the program will start the BIOS update process.

I. After the update is completed, please click [Exit]. At this time, the laptop will automatically shut down.

J. Please press the power button to restart and enter the BIOS setting screen (press the F2 button on the ASUS logo screen after booting to enter the BIOS). After entering, please press the F9 button to read Optimize the default values. When the confirmation screen appears, please press Enter to apply the settings.

K. Please press the F10 button again to save the settings. When the confirmation screen appears, please press the Enter key to save the settings. The computer will automatically restart.