Why won't Windows 10 boot from the installation flash drive?

Question

Windows

Hello, Windows 7 flew, I want to reinstall Windows 10, I made an installation flash drive 10 using a smartphone, but when I connect the flash drive to the PC, it says: “Reboot and select the desired boot device
or insert the bootable media into the selected boot device and press the key”, although the diode on the flash drive is on and BIOS sees it, in the boot menu I put it in the startup priority at 1st place and left only it, tried disconnecting all usb devices from the PC and even tried all usb ports, iso from the official Microsoft website, tried to make images programs: iso 2 usb, etch droid and just moved the unzipped folder to the root of the flash drive (before that I formatted it), I tried everything I can, can anyone know what the problem is?

Answer 1

Most likely, the android program did not register the bootloader in the MBR on the USB flash drive (it seems that root is needed for such things), and I'm not sure that they can.
In this case, legacy bios cannot boot because it needs this bootloader.
You can try to enable EFI mode in the BIOS and boot from a flash drive with it, then instead of loading the MBR, the flash drive is read file-by-file (only FAT32 will work and maybe iso fs)

Answer 2

Why won't Windows 10 boot from the installation flash drive?

Because the flash drive is not bootable or made incorrectly.