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Solved Windows 8.1 to Windows 7 Pro

1samuel411

New Member
Hello, I'm having an issue downgrading from windows 8.1 to windows 7. I bought an ASUS ROG G20AJ in and the computer came with windows 8.1 pre-installed, but I want to switch to windows 7 because some software I need is not compatible with windows 8/8.1. I already set up a USB flash drive with Windows 7 Pro and the download works fine until it boots up Windows 7, I'll post a picture of what I'm receiving,
IMG_20150712_150709_903.jpg

I've tried updating my UEFI BIOS, disabling secure boot and enabling legacy.

I also read online that you have to run the UEFI version of the formatted flash drive, but when I select it my BIOS just opens up.

Thanks for reading, does anyone know what I can do?
 

My Computer

System One

  • OS
    Windows 8.1

Mark Phelps

New Member
VIP Member
Pro User
Windows 8 machine can not ALL be simply downgraded to Windows 7. I checked the ASUS site from your link and they list no Windows 7 drivers for your machine. Installing Win7 is going to then force you to search for all the drivers needed -- on your own!
 

My Computer

CountryBumkin

Gv me thumbs-up if I help
Power User
Are you installing Win7 x64?
One of the common issues is that users try to install X86 version with UEFI enabled in the bios. X86 does not support UEFI so you would have to configure the machine for Legacy boot to install X86 versions of Windows. If you do try to install X86 version setup will run but on the 1
[SUP]st[/SUP]
reboot you will get BIOS error similar to “No bootable devices –Strike F1 to retry boot, F2 for setup utility. Press F5 to run onboard diagnostics”
 

My Computer

System One

  • OS
    Win8.1
    Computer type
    PC/Desktop
    System Manufacturer/Model
    HTPC: Custom built
    CPU
    intel i5-2400
    Motherboard
    Gigabyte GA-Z68MX-DS2H
    Memory
    16GB Corsair DDR3-1600
    Graphics Card(s)
    on-board HD3000
    Sound Card
    On-board
    Monitor(s) Displays
    Samsung 32" LED
    Hard Drives
    eight HGTS Deskstar NAS, 3TB
    seven WD Red NAS, 3TB
    one Seagate ES.2, 1TB
    one 64GB SSD
    PSU
    Corsair 750W
    Case
    Li-Lian case with SuperMicro hotswap backplane
    Cooling
    Case 4 6" fans, stock CPU cooler
    Other Info
    Two 3-Ware (LSI) model 9650SE-8LPML RAID cards.

1samuel411

New Member
Windows 8 machine can not ALL be simply downgraded to Windows 7. I checked the ASUS site from your link and they list no Windows 7 drivers for your machine. Installing Win7 is going to then force you to search for all the drivers needed -- on your own!
Okay so I can download windows 7 but I'll need to find and install all drivers on my own?

If this is the case why is my BIOS not allowing me to switch operating systems?
 

My Computer

System One

  • OS
    Windows 8.1

1samuel411

New Member
Are you installing Win7 x64?
One of the common issues is that users try to install X86 version with UEFI enabled in the bios. X86 does not support UEFI so you would have to configure the machine for Legacy boot to install X86 versions of Windows. If you do try to install X86 version setup will run but on the 1
[SUP]st[/SUP]
reboot you will get BIOS error similar to “No bootable devices –Strike F1 to retry boot, F2 for setup utility. Press F5 to run onboard diagnostics”
I am positive that I am installing the 64 bit version of windows 7.
 

My Computer

System One

  • OS
    Windows 8.1

Ztruker

Well-Known Member
VIP Member
Guru

My Computer

System One

  • OS
    Windows 10 Pro X64
    Computer type
    PC/Desktop
    System Manufacturer/Model
    Lenovo IdeaCenter K450
    CPU
    Intel Quad Core i7-4770 @ 3.4Ghz
    Motherboard
    Lenovo
    Memory
    16.0GB PC3-12800 DDR3 SDRAM 1600 MHz
    Graphics Card(s)
    Intel Integrated HD Graphics
    Sound Card
    Realtek HD Audio
    Monitor(s) Displays
    HP h2207
    Screen Resolution
    1680x1050@59Hz
    Hard Drives
    250GB Samsung EVO SATA-3 SSD;
    2TB Seagate ST2000DM001 SATA-2;
    1.5TB Seagate ST3150041AS SATA
    PSU
    500W
    Keyboard
    Wired USB
    Mouse
    Wired USB
    Internet Speed
    3GB Up, 30GB Down
    Browser
    SeaMonkey
    Antivirus
    Windows Defender; MBAM Pro
    Other Info
    UEFI/GPT
    PLDS DVD-RW DH16AERSH

Ztruker

Well-Known Member
VIP Member
Guru

My Computer

System One

  • OS
    Windows 10 Pro X64
    Computer type
    PC/Desktop
    System Manufacturer/Model
    Lenovo IdeaCenter K450
    CPU
    Intel Quad Core i7-4770 @ 3.4Ghz
    Motherboard
    Lenovo
    Memory
    16.0GB PC3-12800 DDR3 SDRAM 1600 MHz
    Graphics Card(s)
    Intel Integrated HD Graphics
    Sound Card
    Realtek HD Audio
    Monitor(s) Displays
    HP h2207
    Screen Resolution
    1680x1050@59Hz
    Hard Drives
    250GB Samsung EVO SATA-3 SSD;
    2TB Seagate ST2000DM001 SATA-2;
    1.5TB Seagate ST3150041AS SATA
    PSU
    500W
    Keyboard
    Wired USB
    Mouse
    Wired USB
    Internet Speed
    3GB Up, 30GB Down
    Browser
    SeaMonkey
    Antivirus
    Windows Defender; MBAM Pro
    Other Info
    UEFI/GPT
    PLDS DVD-RW DH16AERSH

1samuel411

New Member
Are you installing in UEFI/GPT mode or BIOS/MBR mode? If UEFI:

To install Windows 7 on a UEFI (not BIOS) system, do the following:

1) DISABLE Secure Boot.
2) Boot the Windows 7 x64 DVD in UEFI mode.
3) Delete all partitions & than use Drive Options>NEW to make the UEFI Partitions.
4) screenshots in UEFI (Unified Extensible Firmware Interface) - Install Windows 7 with

Posted by theog here: Sevenforums.com
I am using UEFI, but whenever I boot from the USB flash drive in UEFI mode the UEFI BIOS will just restart and nothing happens.
 

My Computer

System One

  • OS
    Windows 8.1

Ztruker

Well-Known Member
VIP Member
Guru

My Computer

System One

  • OS
    Windows 10 Pro X64
    Computer type
    PC/Desktop
    System Manufacturer/Model
    Lenovo IdeaCenter K450
    CPU
    Intel Quad Core i7-4770 @ 3.4Ghz
    Motherboard
    Lenovo
    Memory
    16.0GB PC3-12800 DDR3 SDRAM 1600 MHz
    Graphics Card(s)
    Intel Integrated HD Graphics
    Sound Card
    Realtek HD Audio
    Monitor(s) Displays
    HP h2207
    Screen Resolution
    1680x1050@59Hz
    Hard Drives
    250GB Samsung EVO SATA-3 SSD;
    2TB Seagate ST2000DM001 SATA-2;
    1.5TB Seagate ST3150041AS SATA
    PSU
    500W
    Keyboard
    Wired USB
    Mouse
    Wired USB
    Internet Speed
    3GB Up, 30GB Down
    Browser
    SeaMonkey
    Antivirus
    Windows Defender; MBAM Pro
    Other Info
    UEFI/GPT
    PLDS DVD-RW DH16AERSH

1samuel411

New Member

My Computer

System One

  • OS
    Windows 8.1

genet

New Member
Guru

My Computer

System One

  • OS
    Windows 10
    Computer type
    Laptop
    System Manufacturer/Model
    Lenovo G580
    CPU
    Intel Core i5-3230M
    Memory
    8 GB
    Graphics Card(s)
    Intel HD Graphics 4000
    Browser
    Microsoft Edge
    Antivirus
    Windows Defender, standard user account
    Other Info
    UEFI firmware (BIOS) embedded Windows 8 product key.

1samuel411

New Member

https://rog.asus.com/forum/showthread.php?70720-ROG-G20AJ-downgrade-to-Windows-7-Possible

...no one has done it as far as I know. BIOS isn't fully ACPI compliant, and you get 0x000000A5 error I believe it is. This is after enabling CSM, disabling secure boot, updating BIOS and disabling fast boot. Also, converting Windows 7 SP1 to UEFI and trying that was as well. Nothing has even gotten close to working.
Oh well then. Thanks for everything, I guess I won't be able to downgrade.
 

My Computer

System One

  • OS
    Windows 8.1

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