How can I make a bootable ISO from a bootable USB flash drive?

Question

ISO

There is a flash drive with which you can install windows 7 in UEFI mode, I want to convert it to an ISO image (to mount on zalman zm-ve300).
Motherboard asrock Z68 Extreme4 Gen3 if that.
I tried it like here https://remontka.pro/obraz-fleshki/
1st point - the computer stopped booting from ISO. Yes, and the boot mode in the boot menu is only usb (uefi is not present)
The 3rd point is an error when trying to extract the boot record from the USB flash drive. deviceiocontrol ioctl_disk_get_partition_info failed!
Therefore, the question is how can I make a bootable ISO from a bootable USB flash drive?

Answer 1

I solved my problem using msi smart tool.
What is the difference between the boot image and the usual one, I could not understand.
I decided to cheat - take a regular image (MSDN) and redo it inside, remove everything that is there and put my own, but what is my own? Firewood nvme, but how to put them there? Yes, just like the last time - through the msi smart tool, but there is also the opportunity not to make a USB flash drive, but immediately write to ISO ...
The casket opened simply.