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allanp81
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Message 1 of 15

P51 legacy boot issues

We've got a couple of P51s delivered and having issues using legacy boot mode with Windows 10.

 

They both have NVME drives and Windows 10 installer refuses to install to the drive as it says the BIOS doesn't support them.

 

Any ideas or is it an issue with the particular NVME drives?

Lenovo Staff
Lenovo Staff
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Location: US
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Message 2 of 15

Re: P51 legacy boot issues

Did you happen to change the system BIOS to Legacy mode? 

 

To do so, go into BIOS F1 setup -> tab over to the "Restart" menu tab option at the top -> scroll down to "OS Optimized Defaults" and set that option to "Disabled". Then, select F9 to setup defaults and F10 to save and exit. 

allanp81
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Message 3 of 15

Re: P51 legacy boot issues

Yes, I have tried changing all of those settings.
Lenovo Staff
Lenovo Staff
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Location: US
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Message 4 of 15

Re: P51 legacy boot issues

I think I'm seeing what you're seeing when I try to install Windows 10 in "Legacy only" mode.  

 

Here's what you can do: 

 

1. Go into BIOS F1 setup -> "Restart" menu tab -> Set "OS Optimized Defaults" to "Disabled.

2. Press F9 to Setup Defaults. 

3. Tab over to the "Startup" menu tab and verify the following settings:

- "UEFI/Legacy Boot" set to [Both]

- "UEFI/Legacy Boot Priority" set to [UEFI First]

- "CSM Support" set to [Yes]

4. Press F10 to Save and Exit the BIOS. 

5. Boot to the Windows 10 installation media. In my case, I'm using a CD/DVD to USB. 

6. Windows 10 should then see your NVMe drive and be able to install the OS cleanly. 

 

 

allanp81
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Message 5 of 15

Re: P51 legacy boot issues

I think the point I'm trying to make is that the legacy boot mode is broken. You can't install Windows 7 (not that I'd expect that to work) or Windows 10 (via MDT or USB install) with legacy mode enabled.

Lenovo Staff
Lenovo Staff
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Location: US
Views: 5,990
Message 6 of 15

Re: P51 legacy boot issues

For NVMe drives, Windows (7 or 10) needs to create a GPT partition on the drive.  You should still be able to boot a GPT partition in Legacy boot mode once the installation is completed.  

allanp81
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Message 7 of 15

Re: P51 legacy boot issues

IT doesn't work either way, regardless of partition type. With a GPT partition it says it can't be installed to a GPT partition and that the BIOS doesn't support it, and with MBR you just get the BIOS error.
Lenovo Staff
Lenovo Staff
Posts: 459
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Location: US
Views: 5,929
Message 8 of 15

Re: P51 legacy boot issues

If you follow these steps (highlighted above), then you CAN get a Windows 10 retail image to load on an NVMe drive on the P51 laptop.  

 

Here's what you can do: 

 

1. Go into BIOS F1 setup -> "Restart" menu tab -> Set "OS Optimized Defaults" to "Disabled.

2. Press F9 to Setup Defaults. 

3. Tab over to the "Startup" menu tab and verify the following settings:

- "UEFI/Legacy Boot" set to [Both]

- "UEFI/Legacy Boot Priority" set to [UEFI First]

- "CSM Support" set to [Yes]

4. Press F10 to Save and Exit the BIOS. 

5. Boot to the Windows 10 installation media. In my case, I'm using a CD/DVD to USB. 

6. Windows 10 should then see your NVMe drive and be able to install the OS cleanly. 

allanp81
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Message 9 of 15

Re: P51 legacy boot issues

We need to use legacy boot though, not uefi mode. All previous models (including the P50) worked fine like this. If this doesn't work then it begs the question what use (if any) having the legacy mode in the bios actually is?
allanp81
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Registered: ‎05-09-2017
Location: GB
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Message 10 of 15

Re: P51 legacy boot issues

So is there no solution to this? Maybe the BIOS needs sorting?

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