As an owner of this same laptop, I’d just like to mention its UEFI will wipe the boot menu after you boot it up from external drive. You’ll need to use something like efibootmgr (Linux) or Bootice (Windows) to put those entries back. Using Bootice in Hiren’s boot is the simplest method. Unfortunately, Windows won’t let you navigate into ESP, and Bootice won’t let you create a new boot entry without immediately pointing it to .efi file. So, you’ll have to create empty .efi file anywhere, select it, and then rewrite the path manually in Bootice. This assumes you know the real full path to the .efi files.