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I had a closer look at the available PC Engines alix 1.c bios updates and noticed alix0.bin and alix2.bin images in the .zip file. A bit of searching found 3D3 BIOS-Upgrade: Which one is the right file? - PC Engines support forum which lists alix0.bin for alix.1 systems and alix2.bin for alix.3 systems. Should work with the provided sb.com.