From Halopedia, the Halo wiki

MJOLNIR GEN3 BIOS startup screen. From Halo Infinite campaign level Warship Gbraakon.
Startup screen for MJOLNIR GEN3 BIOS version 12.22.12.

The MJOLNIR GEN3 BIOS or Basic Input/Output System is a firmware interface for the MJOLNIR Powered Assault Armor [GEN3]. It is developed by Materials Group.[1]


Design details[edit]

The GEN3 BIOS is firmware, designed to be the first code run by the MJOLNIR armor when activated. The initial function of the BIOS is to identify, test, and initialize system devices such as the heads-up display, energy shield systems and other hardware. The BIOS handles most of the MJOLNIR's software functions when initiated. Updates to the BIOS allows newer hardware to be supported and function.[1] It uses high-bandwidth machine interlink and control mediators for perfect neural synchronicity.[2]

As its name suggests, the GEN3 BIOS firmware succeeds the MJOLNIR GEN2 BIOS for the previous MJOLNIR [GEN2] armor. Unlike GEN2 BIOS, GEN3 BIOS is only visible when the armor starts up.[1]

Known versions[edit]

  • ARMOR BIOS // MJOLNIR // VER_12.22.12 / ID_117: Modified from Materials Group's version created on 10 February 2559, John-117's armor uses a customized version modified hand-coded by Dr Catherine Halsey on 19 September 2559.[1][2]

Production notes[edit]

In Discover Hope, John-117's GEN3 BIOS uses version 12.22.19, which was modified by Dr Halsey on 19 September 2561—more than a year after the events of Halo Infinite. In the final release of Halo Infinite, his GEN3 BIOS uses version 12.22.12, and modified on 19 September 2559.[1]

List of appearances[edit]


  1. ^ a b c d e Halo Infinite, campaign mission Ringfall: Warship Gbraakon
  2. ^ a b Halo Encyclopedia (2022 edition), page 64