This guide will walk you through the process of flashing the BIOS on your Steam Deck.
In simple terms, the Basic Input/Output System (BIOS) is a small program stored in a computer's motherboard that helps it start up and communicate with its essential components, such as a display device.
Since the DeckHD display is a completely custom device for the Steam Deck, we need to customise the original BIOS to include the correct display initialisation commands and to let the OS know that we’re booting up with a 1200p display instead of the default 800p. This will ensure compatibility between the computer and the display. Please rest assured, all changes made in our custom BIOS are purely on the Analogix MIPI Receiver's configuration side, and we do not tinker with any other components that can affect the stability of the Steam Deck.
We plan to continue providing BIOS firmware support for the foreseeable future. We are also optimistic about having the opportunity to work together with Valve to release official BIOS which natively support the DeckHD screen.
Users will need to flash our BIOS firmware each time your Steam Deck upgrades to a newer version of SteamOS. There are currently no workarounds for this as each SteamOS update will revert our BIOS firmware. However, we have made this process as easy as possible for you. Once you have our script downloaded in your Steam Deck’s Desktop Mode, all you need to do is execute and wait a few minutes, then you’re good to go!
Upon the first bootup with the DeckHD screen, it is normal to see a static screen because we haven’t adjusted the configurations of the different chips on the motherboard. To fix this, we need to flash our custom BIOS in order for the OS to be compatible with the DeckHD screen.