My bootloader works on QEMU fine but no on real hardware

Question

The bootloader is one of the hello world projects that i have found that in internet: https://johv.dk/blog/bare-metal-assembly-tutorial.html

Before that I had tried to write some bootloader with nasm , fasm etc but none of them worked and just crash.

  format pe64 efi
entry main

section '.text' executable readable

main:
  ;; Recall that RDX contains a pointer to the System Table when
  ;; our application is called. So rdx + 64 is the address of the
  ;; pointer to ConOut, and [rdx + 64] is the pointer itself.
  mov rcx, [rdx + 64]

  ;; Now, RCX contains the ConOut pointer. Thus, the address of
  ;; the OutputString function is at rcx + 8. We'll move this
  ;; function into RAX:
  mov rax, [rcx + 8]

  ;; We already have the ConOut pointer in RCX. Let's load the
  ;; string pointer into RDX:
  mov rdx, string

  ;; Set up the shadow space. We just need to reserve 32 bytes
  ;; on the stack, which we do by manipulating the stack pointer:
  sub rsp, 32

  ;; Now we can call the OutputText function, whose address is
  ;; in the RAX register:
  call rax

  ;; Finally, we'll clean up the shadow space and then return:
  add rsp, 32

  jmp $

section '.data' readable writable

string du 'Hello, World!', 0xD, 0xA, 0

compile the hello world with FASM

fasm hello.asm hello.efi

I make FAT32 file system on usb and copy the executable file :

 mkfs.vfat -F32 /dev/sdb

mount /dev/sdb /mnt
mkdir -p /mnt/EFI/BOOT
cp -r hello.efi /mnt/EFI/BOOT/BOOTx64.EFI
umount /mnt

I select USB flash drive in UEFI boot manager to be booted

Finally the result is crash and black screen when it goes to bootup USB. Even when i go to /BOOT/EFI/ in UEFI shell and try to execute BOOTx64.EFI, the result is crash.