That means 'sudo dd if=/Downloads/kali.iso of=/dev/sdc bs=512k' I even watch the progress thanks to other terminal 'watch -n 10 kill -USR1 $pid_of_dd'. iso file to USB the same way as the kali docs tells me to. To be clear: I everytime check the validity of written files on the USB. I think the problem is my motherboard can't read USB device from BIOS until there are any EFI instructions.
I have followed the steps mentioned in kali docs 7 times. BIOS won't detect my USB until I add the EFI/Boot folder with Boot圆4.efi & grub圆4.efi & grub.cfg files as shown in here. It never mentioned the unebootin.I have the same problem. Stick to installation method in kali docs.
