This message means that a configured boot system command failed.
These are the reasons that can cause this:
Complete these steps in order to resolve this issue:
Note: If the boot commands are not configured, MSFC tries for all bootable files in the order they appear in the Flash device.
Refer to the MSFC or MSFC2 throws SYS-6-READ_BOOTFILE_FAIL error while booting section of Troubleshooting Hardware and Related Issues on the MSFC, MSFC2, and MSFC2a for more information.