How to make a Win PE iso uefi bootable

To create a bootable iso file that works in both modes.

I posted elsewhere the commands, but I suspect that is a little difficult.

There is a simple workaround using free version of Anyburn

open a known working iso file using anyburn ( e.g. a windows installation iso file )

Click Edit Image File



click the little yellow icon and browse to the known good iso ( e.g. windows installation media iso file )








If you want to remove anything, highlight whatever you want to remove and click Remove




If you want to add anything, click ADD and browse to the files you want to add




add the new contents



you can see the new contents are in there, click Next



save the new iso



How to create ISO from Windows 11 22H2.22621.963 bootable USB Stick? | Windows 11 Forum

To boot as UEFI the file system must be Fat32 and to boot as Legacy the MBR partition must be Active

To make a Win 10 USB boot able drive:

Open a CMD window as administrator and type:

diskpart
list disk (it will list all drives. Identify the USB drive number)
select disk n (replace n by the USB drive number obtained with list disk)
clean
convert mbr
create part primary
select part 1
format fs=fat32 quick
assign
active
exit (to exit diskpart)

On Win 10, mount the iso file and copy all files and folders to the USB drive.

SIW2 said:

@Megahertz

from the first post:

Sorry Simon, what I did wrong?

Ok, I got it now.

On my data drive I've made a 2G Fat32 partition and expanded a Win 10 PE based iso. I can boot from it by launching the boot menu (F12) and choosing the Win 10 PE based.