Hi experts

When I try to boot my uefi client from LAN it successfully downloads boot.wim from my WDS 2012, shows the Windows Logo for some seconds, but then it crashes, showing BSOD and the message "UNMOUNTABLE_BOOT_VOLUME".

I'm using the same x64 boot.wim as with the BIOS clients, but with the mbr clients it works.

What is it, that makes my boot.wim unusable for uefi clients?

• Edited by woodrapp Monday, June 08, 2015 1:15 PM

Ok the PE should be 5.0. The first thing I would recommend is make a bootable CD or USB with that boot.wim and see if you can do a UEFI Boot that way.

I have seen this message before on older WDS and WinPE and it was caused by a network issue. That might be what is happening here and if so it is difficult to troubleshoot.

• Proposed as answer by Kate LiMicrosoft contingent staff, Moderator Monday, June 15, 2015 12:13 PM
• Unproposed as answer by woodrapp Monday, June 15, 2015 12:49 PM

I always use the system's boot menu and manually select the UEFI option just to be sure.

If you are doing a PXE boot, usually the screen changes aka text/screen area becomes smaller than if you do a legacy boot.

• Proposed as answer by Kate LiMicrosoft contingent staff, Moderator Monday, June 15, 2015 12:13 PM
• Unproposed as answer by woodrapp Monday, June 15, 2015 12:49 PM

I tried the following:
I made a WinPE bootable USB-Stick with ADK 8.1, booted my PC from that stick in UEFI mode, and it worked.
Then I took the boot.wim from my WinPE Stick and loaded it as an additional boot image on WDS. When I pxe-boot my UEFI client from that boot.wim coming from adk, I get the unmountable_boot_volume error again.

Then I thought, maybe some drivers are missing, and I injected all the device drivers I could find into my boot.wim, but that would not make a difference.

• Edited by woodrapp Monday, June 15, 2015 12:56 PM

Desktop and Notebooks, different models, but always HP.

WinPE 32bit seems not to be bootable on uefi client.