Did you achieve that by creating Windows installation media on a USB flash drive and booting your system from it? If so, what happens if you build Rescue Media to that same flash drive and try to boot your system from it the same way? It should work the same way since the Windows 10 Setup environment runs on WinPE 10, just like Rescue Media.
You mentioned that you did a clean install of Windows 10 on this system. Temporarily attached USB devices won't show up in the BIOS Setup's boot device list of a UEFI system. In terms of getting your USB device to boot, are you trying to accomplish that by going into the BIOS to muck with the boot order or are you accessing the system's one-time boot menu option? You should be doing the latter on a UEFI system. Not only is it more convenient not to have to switch modes when you want to use Rescue Media, but the Rescue Media's "Fix Boot Problems" works differently based on how the Rescue Media was booted - so if you boot in Legacy mode, it won't run the correct boot fixes for an installed OS that you'll want to boot in UEFI mode. That adds a needless complication, but more importantly 64-bit is required for booting in UEFI mode, and if your system boots its normal OS in UEFI mode, you should also boot your Rescue Media in UEFI mode rather than Legacy mode.
In legacy mode, the Laptop reports that it can see the USB pen I've inserted, but selecting it I get a screen stating "reboot and select proper boot device" over and over.įirst, if you're using 64-bit Windows 10 on your system, which I assume you are if the system is that new, then you shouldn't be using 32-bit Windows PE. I have tried a build of the USB pen using 64Bit, WinRE and older Win PE 5.0 with no success. Doing so simply returns the screen the boot selection menu without any errors (in other words, it appears to try but clearly fails for some reason). In UEFI mode I only get the option to boot to the fixed disk or choose an "EFI file" > if I choose this option I can navigate down through the folders on the USB pen to the \EFI\ Boot\ folder and then choose the file "bootia32.efi". 
Switching between UEFI mode and Legacy mode. I cannot for the life of me get that Laptop to boot to the rescue media. I've then built an HP Envy by clean-installing Windows 10 build 1809 (yes, THAT one!) and removing all existing partitions from the disk. Device drivers have been left "as-is" - I'm assuming this should be ok since both the PC I've built the rescue media on and the Laptop are less than 6 months old. No options selected (don't need Wi-Fi, bit locker support, legacy EFI support etc). Hi there I've built a rescue media USB pen drive on an HP Z4 Workstation, using Reflect, Windows 10 1803. By duncan.mcdonald - 13 December 2018 10:18 AM
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