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EFI File Path Media Device Path is defined as NULL terminated string; but chainloader built file paths without final NULL. This caused error with Secure Boot and Linux Foundation PreLoader on Acer with InsydeH20 BIOS. Apparently firmware failed verification with EFI_INVALID_PARAMETER which is considered fatal error by PreLoader. Reported and tested by Giovanni Santini <itachi.sama.amaterasu@gmail.com>