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Finding with NUC12WSv5 and NUC13L3Hv5, with BIOSs v0087 to v0092 and v0043 respectively, when hot restarting, come up with a "The System BIOS has detected an unsuccessful POST attempt..." enter BIOS Y/N.

Downgrading BIOS on the NUC12s doesn't work. v0037 on the NUC13s seemed to be a little better, but the NUC13s only had this issue intermittently, where as the NUC12's it can be reproduced continuously.

Intel/Asus says the fix is to disable boot to network and/or reset BIOS to default. Boot to Network is disabled by default, and resetting to default settings doesn't improve the situation.

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Reset to default
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The fix is to disable the Watchdog in BIOS, then the unit will boot properly.

BIOS -> Advanced -> Onboard Devices -> Watchdog (Untick).

(Watchdog is enabled by default and can potentially be useful for 24/7 operation of different services, however between BIOS bugs and software bugs, the feature really doesn't do what Intel advertised it to do).

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