I encounter another issue with the latest BIOS update for NUC5I5MYBE (058):
Under the Advanced -> Power tab there are three presets for Primary Power settings: low power, balanced and max performance where max performance is the default.
If you choose 'low power' the nuc will always boot as soon as it gets powered (gets connected to wall plug) without the power button beeing pressed totally ignoring the 'After Power Failure' <stay off> setting.
If you change to one of the other presets for Primary Power Settings the NUC will stay off after beeing connected to power outlet till you push the power button.
Is this intended or just another bug?
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