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13 Posts

12-28-2015

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Downgrading a new Ideapad 700

2015-12-28, 18:17 PM

Hi Lenovo community,

I want to downgrade my Windows 10 Y700 ideapad.  I want all the materials needed to downgrade to Windows 7, However, I keep running into an error:

"A required CD/DVD driver is missing"

 

I tried using the external CDDVD drive, and I tried using a bootable USB drive.  And I keep getting stuck there.  When I brought it to a computer tech, he said my options are take the harddrive out and wipe it, or buy an SSD and install Windows 7 on that.  

 

That didn't seem right to me, so I opted not to do that yet.  I was wondering if anybody here has downgraded and encountered the same issue as I am when using the Y700.  

 

 

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2445 Posts

03-09-2012

CA

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Re: Downgrading a new Ideapad 700

2015-12-28, 19:15 PM

You would be better off with the Win 10 OEM.

 

Never the less the system most likely is set as UFIE Bios mode. Win 7 likely needs native Non UFIE BIOS to be set. Go into you BIOS Settings as see if there is another option for the BIOS Dual in the least should work. DVD drive should be fully able to boot and recognized via the BIOS.

 

Note if you have any hardware problems or licensing issues you're on your own when you downgrade like that. Lenovo will want it verified not working on the supplied OS and not two generations older.

T520 Model 4239 Intel(R) Core(TM) i7-2860QMbr>; Nvidia NVS 4200M Win 10 64bit
Z70-80 I7 - 5500U 16GB GB - 1TB HD Win 10 64bit FHD 17.3", G840 w/2GB

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13 Posts

12-28-2015

usa

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  • Message 3 of 6

Re: Downgrading a new Ideapad 700

2015-12-28, 19:50 PM

I tried setting the BIOS to legacy but that does not fix it.  

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2445 Posts

03-09-2012

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Re: Downgrading a new Ideapad 700

2015-12-28, 20:02 PM

Well I may not understand the problem. It should install essentially and allow you to patch drivers as you need.

 

The only thing with the existing HD and a new one is the drives  format or rather partitioning. You'd want MBR partitiong and not GPT Win 10 defaults. A purge of all partitions would be a must including hidden Lenovo parttions. This can only be done via another OS supporting the new format or by some 3rd party tool via a drive caddy which can get tricky. 

 

You used the Window7 OS to partition and format the new spaces it creates and that way its happy and compatible. Its likely this is your problem. I haven't gone down that road myself nor messed with the non MBR drives but I know for sure the notebook will be slower booting and responding once done. What you gain will be no more than some legacey compatiblility at best.

T520 Model 4239 Intel(R) Core(TM) i7-2860QMbr>; Nvidia NVS 4200M Win 10 64bit
Z70-80 I7 - 5500U 16GB GB - 1TB HD Win 10 64bit FHD 17.3", G840 w/2GB

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8350 Posts

01-13-2008

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Re: Downgrading a new Ideapad 700

2015-12-28, 20:11 PM

"A required CD/DVD driver is missing" is a very uninformative catch-all error message.  Often has nothing directly to do with a CD driver.

 

Some things that can cause this: a bad download of the install ISO, bad burn, bad transfer to flash media.

 

One thing a little more driver-related: problems using a USB 3.0 port.  The media boots but when the install code fires up it doesn't know how to talk to the USB 3.0 hardware.  If you have a USB 2.0 port on the laptop, or can connect via a USB 2.0 hub, try that.  Try turning off USB 3.0 mode in BIOS if that's an option.

 

There are other things that can trigger this message too, but those are a few things to check.

 

[edit] Another random suggestion from the interwebs:

 

http://answers.microsoft.com/en-us/windows/forum/windows_7-hardware/a-required-cddvd-device-driver-is-missing-usb/61eda679-66cc-4512-b175-d02871394461?auth=1

 

When Windows is asking for driver, just click Cancel. You will be brought back to the welcome screen. At the welcome screen, remove your USB drive, insert it back to DIFFERENT USB PORT. Click Install Now again. The installation process will be like usual.

 

Z.


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The fine print: I do not work for, nor do I speak for Lenovo. Unsolicited private messages will be ignored - questions and answers belong in the forum so that others may contribute and benefit. ... GeezBlog

 

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1609 Posts

09-16-2014

US

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  • Message 6 of 6

Re: Downgrading a new Ideapad 700

2016-04-05, 20:17 PM

In response to customer reports of receiving a "required cd/dvd drive device driver is missing" error message when trying to downgrade Lenovo laptops with Intel 6th generation processors from Windows 10 to Windows 7, Lenovo has provided a Service TIP with instructions.

 

This error occurs because Intel Skylake architecture is USB 3.0 based, but the Microsoft Windows 7 boot.wim and install.wim do not have Intel USB 3.0 support added.

 

The Service TIP can be found here: https://support.lenovo.com/us/en/documents/SF16-T0034

 

Thank you,

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