Acer TravelMate P245-MG - Manual (Page 54)

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English
Windows will restart, replace Windows 7 with Windows 8, and then start the
Windows 8 setup process.
Note: After configuring Windows 8, enter the BIOS (press <F2> when
starting your computer) enter the Boot menu and change the Boot
Mode to UEFI.
Please refer to "Changing BIOS settings" on page 36.
Changing to Windows 7
Note: To change back to Windows 7, you must change Boot Mode
back to Legacy BIOS. Windows 7 will not start if the BIOS Mode is
set to UEFI. Please refer to "Changing BIOS settings" on page 36.
Start Windows 8; from Start, type ‘recovery’ to open Acer Recovery Management.
1 Select Restore Factory Settings.
2 Select Yes.