This error usually indicates an unrecognised image format or, less commonly, a corrupted image.

Things to try:

  * Check that your build of iPXE supports the type of image you are trying to boot.  You can see the list of supported image types in the iPXE start-up banner; for example:<code>    iPXE 1.0.0+ -- Open Source Network Boot Firmware -- http://ipxe.org
    Features: HTTP iSCSI DNS TFTP AoE VLAN bzImage COMBOOT ELF MBOOT PXE PXEXT</code> shows that bzImage, COMBOOT, ELF, Multiboot, and PXE images are supported in this build of iPXE.

  * If you are running a UEFI version of iPXE then only EFI binaries can be loaded.  PXE binaries such as ''pxelinux.0'' and ''memdisk'' use legacy BIOS calls and can never work on UEFI.
    * If you are trying to load a Linux kernel (or other EFI binary) then you can use iPXE to load it directly; there is no need to load ''pxelinux.0'' first.
    * If you are trying to load a Linux kernel, make sure it is built with ''CONFIG_EFI_STUB'' enabled.  Most distribution kernels will already be built with ''CONFIG_EFI_STUB'' enabled.
    * If you are trying to display a pxelinux menu then you may want to investigate iPXE's native [[:cmd:choose|menuing]] capabilities.

  * Check that the image you are trying to boot has not been corrupted in any way.
    * You can use the ''[[:cmd:imgstat]]'' command to check that the filesize is correct and that the file has been detected as the correct type.

  * If you are trying to boot an iPXE script, check that the "''#!ipxe''" signature is present at the beginning of the script.
    * If you have edited the script on a Windows machine, check that the script was saved using ASCII (or UTF-8) rather than UTF-16 encoding, and that your Windows editor has not inserted a byte order mark (BOM) at the start of the file.