How to create a dual-boot pen-drive supporting UEFI and Legacy BIOS

I also have a Laptop whose motherboard BIOS supports both Legacy and UEFI Boot options.

I use RUFUS as a utility to create bootable media for both Linux and Windows platforms. It has options such as Partition scheme and target system type which creates the bootable media for below mentioned types.

1. MBR Partition scheme for BIOS (Legacy) and UEFI
2. MBR Partition scheme for UEFI
3. GPT Partition scheme for UEFI

And also for specific type of ISO files supported with EFI-CSM , the utility is able to create bootable media accordingly.

To create a bootable USB that supports both Legacy and UEFI Boot options proceed as follows.

1. Open Rufus utility.
2. Select the USB drive onto which you want to create the live bootable media.
3. In order to support both UEFI and Legacy boot select the first option i.e MBR Partition scheme for BIOS and UEFI under partition scheme and target system type.
4. Select file system as FAT32 and Default Cluster size.
5. Tick the box with Create a bootable disk using and browse for the ISO file.
6. Click START and wait for it to complete.

After completion boot the USB on any PC and you will see that it provides option to boot through LEGACY and also through UEFI.

(NOTE: Ensure that your BIOS settings have been set to allow Legacy Boot options and not strictly UEFI.)

Here is a picture of how it works.!