Updating an ASUS motherboard BIOS from Linux, with no monitor or keyboard
How a headless Ryzen server went from a 2021 BIOS to the newest one over SSH, using fwupd and the board's own UEFI capsule support, and the two prompts that still needed a screen. Warning. ASUS does not support this way of updating. It worked on my board; it is not guaranteed to work on yours. A failed or interrupted BIOS flash can leave a board unable to start. Do it only if you accept that risk, never cut the power while it flashes, and have a screen and keyboard within reach. The machine ASUS PRIME B550M-A, AMD Ryzen 9 5900X, 4 memory sticks (mixed kits), RTX 3060 Kubuntu 22.04 with fwupd 1.7.9 Headless: no monitor or keyboard, reached only over SSH BIOS 2423 from August 2021 The work was done remotely over SSH with the help of an AI assistant (Claude, by Anthropic, Opus 5.5), which ran and checked every step below. Why update at all The old BIOS was four years behind. ASUS's own release notes for this board list, between 2423 and the newest version: sever...
