Overall, it’s a painful thing to do – most people who ask want to do this as part of an OS refresh, preserving user data and settings at the same time without moving data off of the system. We don’t recommend even trying – just keep the system running legacy BIOS emulation until it’s replaced (or until you “reclaim” the system for redeployment).
If you just want to automate the switchover (and destroy the contents of the drive later), it’s a little easier, but still vendor-specific (to modify firmware settings). You would only want to consider this for Windows 8 logo-certified devices (those running UEFI 2.3.1 or higher), since previous UEFI versions were way too flaky. I would also start thinking about this as a point-forward change: Stop deploying Windows 7 systems using legacy BIOS emulation if you are planning to upgrade or refresh them to Windows 10 sometime within the machine’s lifetime. Thanks, -Michael From: [email protected] [mailto:[email protected]] On Behalf Of Niall Brady Sent: Monday, May 18, 2015 9:49 PM To: [email protected] Subject: Re: [mssms] Switch to UEFI during OSD i've thought about it and perhaps you could build some type of script to run before the prestart even, which checks for UEFI and if not, set's the bios to UEFI (lenovo and others have scripts for that), then reboots to the correct mode before allowing you to select a UEFI mode task sequence you'd have to use something that kicks off before the task sequence engine, like this<http://www.windows-noob.com/forums/index.php?/topic/12277-updated-script-how-can-i-check-for-network-connectivity-storage-before-starting-a-task-sequence-in-system-center-2012-r2-configuration-manager/> i have not tested it but i believe it will work for some hardware at least, the key is that it would be a script that is not task sequence aware, that runs before your task sequence and involves user input of some sort (to make the decision) On Tue, May 19, 2015 at 1:07 AM, Jason Sandys <[email protected]<mailto:[email protected]>> wrote: Correct. There have discussions on this by Tim Mintner, Keith Garner, and Michael Niehaus and the conclusion is that this is not possible in an unattended manner or with a single TS. J From: [email protected]<mailto:[email protected]> [mailto:[email protected]<mailto:[email protected]>] On Behalf Of Roland Janus Sent: Monday, May 18, 2015 5:02 PM To: [email protected]<mailto:[email protected]> Subject: [mssms] Switch to UEFI during OSD Anyone tried that? Switching the BIOS to UEFI with a command line isn’t the problem, but doing this as part of OSD might be. Refresh using hardlinks can’t work, but anyone tried switching to UEFI during OSD for baremetal? (That of course would lead to a mix of legacy and UEFI installations) Assuming the computer is currently configured to use Legacy bios mode, that seems like a chicken/egg problem. -Roland
