Acer TravelMate P245-MG - Manual (Page 55)

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3 Windows 7, and then click OK and follow the instructions.
Windows will restart, replace Windows 8 with Windows 7, and then start the
Windows 7 setup process.
Changing BIOS settings
To change your BIOS settings, press <F2> when you see the Acer logo during boot
up.
Use the arrow keys to select Boot > Boot Mode.
Press <Enter>, then use the arrow keys to select UEFI or Legacy BIOS.