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The LED in the mute key doesn't work out of the box. To enable it, add a file /etc/modprobe.d/hp-spectre.conf with the following contents:

BIOS updates are actually done via the hidden HP_TOOLS service partition which you can get to by pressing F2 after switching on the notebook or from the Startup Menu. The update you download from the hp service page merely copies the new BIOS files to that partition.