1, ASUS notebook USB flash drive startup: first plug in the USB flash drive, restart the computer, press ESC when the ASUS screen appears, and then select USB*** in the displayed startup screen to start the installation. Please refer to the following figure:
2. If there is no USB boot item, I suggest you set BIOS options: press F2 to enter the BIOS, set boot-LunchCSM- Enable, Secure-Secure Boot Control-Disable, and then press F 10 to save and exit.
3. Replace other U disk image files or system CD, and press ESC to select the startup item to try.
I hope the above information can help you. If the above reply still doesn't help you solve the problem, you are welcome to continue asking questions. You can also log on to ASUS online instant service: /support/ for further consultation with engineers. Thank you for your support and attention. Wish you a happy life!