B4zookaw
VALUED CONTRIBUTOR
Agree with pretty much all you said other than it's an OEM Motherboard. I think the BIOS is OEM, in so far as PCS/Gigabtye took the standard bios update file, and altered to include the PCS logo rather than the Gigabyte one. Unfortunately they've done it in such a manner that the BIOS updater sees this as a completely different BIOS from the standard one, even they they are the same version and alike in every other way.BIOSes are released over time, version by version to included further compatibility, roll out bug fixes or something.
It would have been on the latest stable BIOS at the time of building, they can't see the future and give you something that doesn't exist!
You do have the right to update it, you just need to contact them to do that or follow the guide above, there's nothing unusual about this. You've bought an OEM PC with an OEM motherboard, it's not a consumer board, so you need an OEM BIOS, they aren't available on manufacturers websites, only through OEMs such as PCS.
If you'd just contacted them first you would have flashed it ages ago. It's really not an issue, they were open until 8 tonight, you could have called them after being recommended to do so by @TonyCarter at 17:15 and it would have been done.
Or as in the guide linked by @B4zookaw you can easily flash it yourself and not have to contact PCS at all. It would literally take 10 minutes.