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Place the firmware update file somewhere in the pcds file system.  It may need to be unpacked from a .zip file first. The filename will look something like BIOS_H12SSW-1B2B_20211020_2.3_STDsp.bin which you can find here:

View file
nameBIOS_H12SSW-1B2B_20211020_2.3_STDsp.bin
height250

It may be best to issue 'sudo halt' on the machine that is about to be updated.  I'm not sure this is strictly necessary, but there was a case where a machine didn't survive the BIOS updated and was effectively 'bricked'.  Making sure nothing else is going on during the update seems prudent.

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