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 leachimresalb 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.

Good idea. I did as you told and used the boot.wim in a bootable usb-stick. When I boot my client from that stick, I can select languages and then I am asked to select drivers. This message appears either way, legacy or uefi. but the image seems to be mountable, however... how can I tell if the client is really running in UEFI? I disabled legacy in bios...