Question PC won't post after BIOS update - MSI B450I Gaming Plus AC

Apr 18, 2019
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I have recently updated my BIOS from version 7A40vA4 to version 7A40vA6. Motherboard is MSI B450I Gaming Plus AC. Update went fine and it restarted normally but after like 5 minutes of waiting, there's no display in the monitor and peripherals doesn't light up. Since the motherboard doesn't have an included jumper cap for clearing CMOS, I have used a screwdriver and stick it to the CMOS jumper for a few seconds. But it still wont work.

Upon searching the forums, I found out that I shouldn't have updated the BIOS to the latest one since it's only for the upcoming Ryzen 3rd Gen CPUs. Specifically this thread:
https://forum-en.msi.com/index.php?...GsrQNw8Y905Y5tSfKk0yBzAvk_nuHLx_Cl1DeP0xRTSLE

I would like to ask for any fix on how to restore the previous BIOS version for the PC to work again. Thanks!