def METHOD_NAME(self):
    """Get the TPM Firmware Version (formatted according to vendor conventions)."""
    key = f"{self.manufacturer}.{self.vendor_string}"
    ver1 = self.capabilities.properties_fixed.firmware_version_1
    ver2 = self.capabilities.properties_fixed.firmware_version_2
    return defaultdict(
        lambda: f"{ver1:x}.{ver2:x}", {"IBM.SW TPM": f"{ver1:x}.{ver2:x}"}
    )[key]