Is Windows 10 option to enter UEFI reliable if I enter Ultra Fast Boot?

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Timstertimster

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Apr 3, 2013
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Can I reliably enter UEFI if I need to, by using Windows 10's Shift-Reboot option Menu (you know, where you get the recovery options etc, under advanced... "enter UEFI on restart")?

I'd hate to end up having to figure out how to get into UEFI by other means just because I wanted to shave off 10 secs of my boot times by entering Ultra Fast mode
 
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drea.drechsler

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Oct 16, 2017
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In general, no it's not reliable because POST progresses too fast. The reliable way to enter UEFI when in 'fast boot' mode is to initiate it from within windows: when going to shut down, instead of clicking on 'shut down' press and hold shift then click on 'RESTART' instead. It will take you to a blue screen with various options, pick “Troubleshoot,” then “Advanced options,” then “Startup Settings,” and then “Restart.”

Also, check that your BIOS has an option to clear CMOS on failed boot and enable it. That way if things go amiss during a boot it will clear CMOS and take you right into BIOS setup on the next boot attempt. On my system I can force a failed boot by pressing and holding the power switch during the windows start, when the spinner is still spinning. Just make sure you save CMOS settings in a profile.
 
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Timstertimster

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Thanks for reply. I'm confused, because you say exactly what I asked about:

- I said: can I use Windows shift-click reliably?

- you said: no, you need to use shift-click in wnidows.

Uhm, either you misread my question or I'm misreading your answer.
 
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drea.drechsler

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I think obviously I misunderstood your question!

It seems to me that Windows' 'shift-click' method for entering BIOS uses resources that were specifically put in UEFI for that purpose so I believe it to be reliable at least for the time being. Whether Microsoft continues to offer that method in future Windows feature updates is another matter.

But one sure-fire method to get back into BIOS is to reset CMOS. Be sure to save settings profiles so that you can restore quickly after a reset.
 
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