Still have a bios bug on an DH55TC mobo

Hi, i upgraded the bios with a "recent" firmware (TC0048P.BIO) found on a forum and the pb is still present in dmesg:
Code:DMAR: [Firmware Bug]: Your BIOS is broken; DMAR reported at address fed90000 returns all ones!
BIOS vendor: Intel Corp.; Ver: TCIBX10H.86A.0048.2011.1206.1342; Product Version:Running Slackware64-current (kernel 5.12.12). Any advicies? Thanks ;)