Once again, I am trying to post the correct information about this computer. The PowerSpec B745 does NOT use the MSI Z490 GAMING Plus board. You will not be able to flash that BIOS; it will be unrecognized by the flashing tool. The PowerSpec B745 uses the cheaper, OEM MSI Z490 (non-gaming) Plus board with the model number Z490-S01, found on the MSI China website. The original poster found the correct support site and posted the link above (which I was apparently blocked from doing earlier). I can confirm that this BIOS works great and fixes a couple of bugs in the original PowerSpec BIOS. Make sure you disable MSI Fast Boot before flashing because it is functional in the newer MSI BIOS. If you leave it on, it will be nearly impossible to get back into the BIOS to change settings because it starts booting Windows right away. This setting has no effect on the broken PowerSpec BIOS.
As of this writing, the latest BIOS version for this board is 7C98v154, released December 15, 2020. I see that MSI recently released version 7C75vA6 for the Gaming Plus board, adding support for 11th generation CPUs. Hopefully, this update gets ported over to the Z490-S01 for the PowerSpec B745 in an update soon as well.
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