Good morning to the whole community.
I'm trying to understand where is the mistake I'm making even though I have dozens of tests without a correct result, that is, I can't boot the ISO created from a bootable USB pen drive.
Premise
I downloaded Kaspersky Rescue Disk. The file is an ISO. I install the ISO on the pen drive through RUFUS. The pen drive is bootable and its operation is correct (tested on PC after bios post and before the operating system).
Problem
How do I get the reverse process now? That is, through imgburn I want to create a bootable ISO starting from the pen drive.
Resolution (currently unsolved).
Obviously I start the ImgBurn program, click on creating a new image from files/folders.
I select the source letter of the pen drive, select the advanced tab, then select the bootable disk tab.
I activate the make a bootable disk flag
Now I tried to extract the boot image and insert it into the boot image.
Start the creation of the ISO but the newly created file is not bootable (tested with a virtual machine) while the original ISO works correctly (again tested with a virtual machine).
I also tried looking for a boot image from the disk, but I can't figure out which file to select and if there is any other flag or value I need to set
This helps me understand which are the correct settings I need to use. The problem is that some programs allow you to directly create a bootable USB pen drive without the possibility of having an ISO to manage instead.
Where is the error? Thank you