Windows 8 and 8.1 Forums


How to downgrade UEFI W8 laptop to W7

  1. #1


    Posts : 7
    Win 7

    How to downgrade UEFI W8 laptop to W7


    Please advice.
    Lenovo B575e notebook.

    I need to install Windows 7 to factory preinstalled Windows 8 Lenovo UEFI laptop.
    Installation media W7 Pro OEM DVD from internal DVD drive.
    Likely there is no need to restore Windows 8 later - so just a clean Windows 7 installation.

    Is it correct just to Disable Secure boot in Bios?
    Or is there something else requirements?

    On BIOS security tab there is also "Reset to Setup Mode" and Restore Factory Keys.

    Thank you.

      My System SpecsSystem Spec

  2. #2


    Posts : 1,093
    Windows 8 Pro Windows 8.1 Preview


    This should work for your purposes:

    Downgrade Windows 8 to Windows 7

    Good luck.
      My System SpecsSystem Spec

  3. #3


    Posts : 7
    Win 7

    Can't UEFI BIOS PC boot and install from W7 DVD


    Thanks for the link - a great tutorial.

    But what does UEFI stands for - can't it boot from normal Windows 7 DVD and install Win 7?

    May it be that there is a BIOS selection to bypass or switch off UEFI?

    Thanks.

    PS There is Startup menu and selection UEFI/Legacy boot - does the last "Legacy only" means that UEFI Boot installation media is not required?
      My System SpecsSystem Spec

  4. #4


    Posts : 1,093
    Windows 8 Pro Windows 8.1 Preview


    UEFI stands for Unified Extensible Firmware Interface.

    You can install Windows 7 as either a Legacy install or UEFI install because your BIOS supports both methods.

    I cannot tell you exactly how to configure your BIOS for either install but I can only image that if you set your BIOS to defaults it should let you do either. Once done, if you invoke the boot menu on power up (F12 maybe?), you should be presented with an option to select two optical device options as follows:

    1-Optical Device Name
    2-UEFI Optical Device Name

    If you select 1 it should proceed with a Legacy (non-UEFI) installation
    If you select 2 it should proceed with a UEFI installation

    However, if you are looking for someone to walk you through this entire sequence then I am not the right person for the job. I have already pointed you to the correct tutorial and now I have given you a bit more insight as to how other things might work but I would caution you to have your factory restore discs ready if things go wrong because you will be wiping that partition structure clean as part of the new installation process and there will be no way back without those discs. Now, if you don't see those options (as I described) on your boot menu, then you will have to break out your owner's manual for additional information. This is all the information I can give you from afar and I hope it has helped you. Good luck.
      My System SpecsSystem Spec

  5. #5


    Posts : 1,093
    Windows 8 Pro Windows 8.1 Preview


    Quote Originally Posted by robilong View Post
    PS There is Startup menu and selection UEFI/Legacy boot - does the last "Legacy only" means that UEFI Boot installation media is not required?
    I must be getting old but I could swear that PS was not there on your original post. So, if it was not, next time, don't update your original post. Instead, please post it as a new question. Anyway, the Windows 7 DVD should be capable of doing either a UEFI or Legacy install; therefore, your installation option will direct the installer accordingly. So, "Legacy only" will start a non-UEFI installation. Good luck.
      My System SpecsSystem Spec

  6. #6


    Posts : 5,592
    ME, XP,Vista,Win7,Win8,Win8.1


    Downgrade Windows 8 to Windows 7

    You need to do all of the step 3 first.


    Quote Originally Posted by theog
    3) Reset BIOS to default, and reboot to BIOS make sure Secure Boot is disabled.
    Make sure CSM is ENABLED, & set to UEFI boot.
    NOTE: Check your manufacturer's uEFI BIOS manual for settings.

    Boot the Windows 7 x64 DVD in UEFI mode.

    Click image for larger version
      My System SpecsSystem Spec

  7. #7


    Posts : 1,093
    Windows 8 Pro Windows 8.1 Preview


    Hi Theog,

    Great information but I'm not sure the OP has made a final decision as to which way he really wants to go (UEFI or Legacy) with his installation. So, are you recommending UEFI is the only way he should go?
      My System SpecsSystem Spec

  8. #8


    Posts : 5,592
    ME, XP,Vista,Win7,Win8,Win8.1


    Quote Originally Posted by JustATest View Post
    Hi Theog,

    Great information but I'm not sure the OP has made a final decision as to which way he really wants to go (UEFI or Legacy) with his installation. So, are you recommending UEFI is the only way he should go?
    NO,
    Legacy is over 25 years old, UEFI is about 20 year old.
      My System SpecsSystem Spec

  9. #9


    Posts : 7
    Win 7


    Quote Originally Posted by JustATest View Post
    Hi Theog,

    Great information but I'm not sure the OP has made a final decision as to which way he really wants to go (UEFI or Legacy) with his installation. So, are you recommending UEFI is the only way he should go?
    Thanks.
    I disabled UEFI boot and picked from BIOS Legacy only as I believe this is a more fool proof and stable solution.
    Installed from Windows 7 DVD, deleted all w8 partitions and created one new one.

    Now it looks like W7 works normally, except I'm still struggling with drivers, because all manufacturer consider an important part of a game not to provide sufficient info, where and what exactly is packed. So after video, audio and network drivers there still are 5 unknown devices.

    Thank you.

    PS. It looks like there are also occasions, when ordinary W7 64 bit installation DVD has to be converted into UEFI boot media.
    like in this description Downgrade Windows 8 to Windows 7
      My System SpecsSystem Spec

  10. #10


    Posts : 5,592
    ME, XP,Vista,Win7,Win8,Win8.1


    Quote Originally Posted by robilong
    PS. It looks like there are also occasions, when ordinary W7 64 bit installation DVD has to be converted into UEFI boot media.
    like in this description
    Downgrade Windows 8 to Windows 7

    Can you make a quote.
      My System SpecsSystem Spec

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