📎 AI Summary:
The thread discusses issues with creating a bootable USB flash drive from an ISO that is only bootable via DVD on UEFI systems, specifically encountering an error related to missing 'EFI\boot\bootx64.efi'. The original poster seeks solutions to convert a DVD-only ISO into a USB-bootable format or to manually set up a UEFI bootable USB with the necessary files, noting that standard tools like Rufus and Ventoy have limitations. Other participants suggest alternative approaches, such as using a Windows ISO or manually extracting files, but no definitive solution is provided, and the overall sentiment is that the process is challenging.
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pstein

Extraordinary Member
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454
Thread Author #1
I have an UEFI-based ISO file for a tool on windows (This tool is NOT a WinOS but a separate utility tool).
If I burn this ISO onto a DVD and boot it on an UEFI computer (without Secure Boot) everything works.

However If I put this ISO with e.g. Rufus onto an USB flash drive then the USB flash drive does not boot and show an error message:

"Could not locate 'EFI\boot\bootx64.efi': Not found

Yes, the file and the directory is missing.

After a long search I found a hint:
Surprisingly a DVD-bootable ISO is NOT automatically bootable from USB flash drive due to different handling of Bootmanager.

Interesting. I have not expected that.

Now my problem is:

Can I convert this only-on-DVD-bootable ISO to a bootable-from-USB-flash-drive ISO?

Alternatively it would be acceptable to create at first an UEFI-bootable USB flash drive and extract (which?) tool files out of the ISO onto this USB flash drive. I guess I have to declare (where?) what program should be started during USB flash drive boot.

Any suggestions?

E.g.Ventoy does not help.

It must be a solution which prepares the USB flash drive for simple UEFI boot and let me add (before or afterwards) an additional tool.

Peter
 

Solution
G
Why not download a Windows iso file and make a bootable USB for Windows computer,just like this,in this way, the problem will be solved easily.
I don’t think that using DVD is more suitable than USB, but from a security point of view, it’s better to use USB to make a bootable drive.
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P

pstein

Extraordinary Member
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Joined
Mar 20, 2010
Messages
454
Thread Author #2
I have an UEFI-based ISO file for a tool on windows (This tool is NOT a WinOS but a separate utility tool).
If I burn this ISO onto a DVD and boot it on an UEFI computer (without Secure Boot) everything works.

However If I put this ISO with e.g. Rufus onto an USB flash drive then the USB flash drive does not boot and show an error message:

"Could not locate 'EFI\boot\bootx64.efi': Not found

Yes, the file and the directory is missing.

After a long search I found a hint:
Surprisingly a DVD-bootable ISO is NOT automatically bootable from USB flash drive due to different handling of Bootmanager.

Interesting. I have not expected that.

Now my problem is:

Can I convert this only-on-DVD-bootable ISO to a bootable-from-USB-flash-drive ISO?

Alternatively it would be acceptable to create at first an UEFI-bootable USB flash drive and extract (which?) tool files out of the ISO onto this USB flash drive. I guess I have to declare (where?) what program should be started during USB flash drive boot.

Any suggestions?

E.g.Ventoy does not help.

It must be a solution which prepares the USB flash drive for simple UEFI boot and let me add (before or afterwards) an additional tool.

Peter
 

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P

pstein

Extraordinary Member
Member details
Joined
Mar 20, 2010
Messages
454
Thread Author #3
I have an UEFI-based ISO file for a tool on windows (This tool is NOT a WinOS but a separate utility tool).
If I burn this ISO onto a DVD and boot it on an UEFI computer (without Secure Boot) everything works.

However If I put this ISO with e.g. Rufus onto an USB flash drive then the USB flash drive does not boot and show an error message:

"Could not locate 'EFI\boot\bootx64.efi': Not found

Yes, the file and the directory is missing.

After a long search I found a hint:
Surprisingly a DVD-bootable ISO is NOT automatically bootable from USB flash drive due to different handling of Bootmanager.

Interesting. I have not expected that.

Now my problem is:

Can I convert this only-on-DVD-bootable ISO to a bootable-from-USB-flash-drive ISO?

Alternatively it would be acceptable to create at first an UEFI-bootable USB flash drive and extract (which?) tool files out of the ISO onto this USB flash drive. I guess I have to declare (where?) what program should be started during USB flash drive boot.

Any suggestions?

E.g.Ventoy does not help.

It must be a solution which prepares the USB flash drive for simple UEFI boot and let me add (before or afterwards) an additional tool.

Peter
 

Upvote 0 Downvote
P

pstein

Extraordinary Member
Member details
Joined
Mar 20, 2010
Messages
454
Thread Author #4
I have an UEFI-based ISO file for a tool on windows (This tool is NOT a WinOS but a separate utility tool).
If I burn this ISO onto a DVD and boot it on an UEFI computer (without Secure Boot) everything works.

However If I put this ISO with e.g. Rufus onto an USB flash drive then the USB flash drive does not boot and show an error message:

"Could not locate 'EFI\boot\bootx64.efi': Not found

Yes, the file and the directory is missing.

After a long search I found a hint:
Surprisingly a DVD-bootable ISO is NOT automatically bootable from USB flash drive due to different handling of Bootmanager.

Interesting. I have not expected that.

Now my problem is:

Can I convert this only-on-DVD-bootable ISO to a bootable-from-USB-flash-drive ISO?

Alternatively it would be acceptable to create at first an UEFI-bootable USB flash drive and extract (which?) tool files out of the ISO onto this USB flash drive. I guess I have to declare (where?) what program should be started during USB flash drive boot.

Any suggestions?

E.g.Ventoy does not help.

It must be a solution which prepares the USB flash drive for simple UEFI boot and let me add (before or afterwards) an additional tool.

Peter
 

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kemical

kemical

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36,163
#5
Unsure what happened here but i merged all threads.
 

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Guyiss

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#7
Why not download a Windows iso file and make a bootable USB for Windows computer,just like this,in this way, the problem will be solved easily.
I don’t think that using DVD is more suitable than USB, but from a security point of view, it’s better to use USB to make a bootable drive.
 

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Solution
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Guyiss

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#8
Why not download a Windows iso file and make a bootable USB for Windows computer,in this way, the problem will be solved easily.
 

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M

mizzchic

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Mar 28, 2018
Messages
21
#9
im not sure if i get usb and flash drive ? I found my old fone i didt no how or why thats on
An image from 'How to install an UEFI-based ISO (bootable with DVD) on an USB flash?'. Screenshot showing Windows device info with option to remove from account or change password.
 

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