Windows 8.1/10 dual boot on Surface Pro 3

Discussion in 'Windows 10' started by 5MpFnV45, Aug 5, 2015.

  1. 5MpFnV45

    5MpFnV45 MDL Novice

    Aug 4, 2015
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    Hello. This is my first post...

    A couple days ago, I tried a dual installation of 8.1 and 10 on my SP3Pro.

    1- 8.1 bare metal restore using SurfacePro3_BMR_20_5.268.0.zip from MS ; activation and updates ok
    2- upgraded to 10 using the iso downloaded from MS ; upgraded using setup.exe in explorer ; got it activated and updated (I deactivated KB3035583)
    3- system partition shrink in order to get room for a second OS
    4- downloaded Win 8.1 iso from MS. ("normal" iso as there is no SP3 Pro iso, only BRM archive = reset to factory)
    5- deactivated secure boot
    6- booted from usb-iso and installed 8.1 ; got it updated and activated ; no key needed

    In 8.1 Windows Update, I also deactivated firmware update (don't understand this firmware update, as WU already did it for W10...

    So I currently have win 8.1 and win 10 dual booting, all updated and activated. When I started, I was pretty sure it could'nt be done, as there is only one licence attached to the device !

    But I have glitches :

    - if I reactivate secure boot in UEFI, there's no more boot menu, and it boots 8.1 only.

    - int 8.1 could'nt get Windows logo touch button to work. Could'nt get power button in start screen (I tried the registry tricks found with Google : failed) ; driver found on MS website shows an error in device manager (could'nt start, error 10)

    - in 8.1 could'nt get power and volume button to work (I have to power off using "start menu"

    Apart from this, everything seems to work fine

    Some thoughts ?