When Rebootng, Keep press , it is better press 2times in every one second till the Hotkey Menu appear, as the above menu.
If still without Hotkey menu appear, while PC entering OS, kindly stop pressing , you should rebooting PC after completely entering into OS, then repeat the 1 step.
If after trying the above two steps, while failed, kindly refer to the CMOS setting in lastquestion (without installation menu).
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, it is better press 2times in every one second till the Hotkey Menu appear, as the above menu.
