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How to update BIOS on computer that won't boot up?

My son is building his first PC with my assistance, and we're running into an issue where the PC will not boot up into POST. No signal on monitor, no beeps or POST codes. CPU fan and system fans are spinning up as expected, video card shows a power light on. Also tried it without the video card plugged in, using just the native video - no change.

We confirmed that the CPU is supported by the motherboard, but the manufacturer states that it is only supported with a BIOS update. Problem is, we cannot get to the BIOS screens, or even to the point where it is attempting to boot from a drive or device.

Given that we cannot get past the POST stage, how can we update the BIOS on this system so that the CPU is supported?

UPDATE: The motherboard appears to be a Biostar Biostar TB250-BTC+ if that helps. CPU in question is an Intel Core i7 7700K

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