UEFI Capsule Update

Rollback protection

By default the LowestSupportedVersion field in UEFI Capsule FMP Payload Header is set to the current L4T version, which prevents bootloader downgrade. TEGRA_UEFI_LOWEST_SUPPORTED_VERSION variable can be used to override this behaviour.

For example to allow downgrading to L4T 36.4.3 add the following line to your machine config:

TEGRA_UEFI_LOWEST_SUPPORTED_VERSION = "0x00240403"