What method is used to generate a UEFI boot tool from an existing non-UEFI system?
What method is used to generate a UEFI boot tool from an existing non-UEFI system?
Could someone without a programming background produce a UEFI-bootable USB drive using a non-UEFI-compliant tool? For instance, older versions of Hiren's Boot Disk or memtest86 are still limited to BIOS-only setups. Are there ways to modify UEFI versions of these tools so they can boot in real UEFI mode instead of CSM? (I’m aware of later UEFI updates for these utilities but that’s not the main question.) I’ve studied making UEFI-bootable USB disks, though most references focus on Windows installation media. I’m familiar with creating bootable GPT partitions and needing an EFI\Boot\bootx64.efi file. That’s essentially all I understand so far. Should the bootx64.efi be tailored for each application? Is it feasible to repurpose an existing bootx64.efi file to support different software? Thank you for any helpful explanations or links.
Using the BCD store allows you to load ISOs from any device through the boot menu. This can be achieved using only Windows commands, though EasyBCD simplifies the process. Starting from a functional Windows 7 and above, you install the MBR and BCD files onto the USB drive, then use the BCDstore from that USB so EasyBCD functions on the installed Windows BCD but not on the original system. You transfer the ISO, add it as a new entry, and place it in the USB boot menu. EasyBCD supports a wide range of formats including ISO, hard disk images, floppy drives, Windows PE, and Linux. There are many detailed guides available online for both EasyBCD and BCDstore if you prefer an older command-based approach.