ASRock Z370 Fatal1ty Gaming K6 revert BIOS

I've just updated ASRock Z370 Fatal1ty Gaming K6 to last BIOS 4.0 and have a various problem with stability system: application crash, game (Witcher 3) sometime freezes, blue screen on Windows 10.

Pleade help me to revert BIOS to stability 1.60. I know when I processing update to 4.0 I accept "User will not able to flash to previous BIOS once upgrading to this BIOS version." But now I just have unstable system and nothing else. I have one real solution - buy another motherboard for example ASUS ROG STRIX Z390-F GAMING.

What was the reason for updating your BIOS?

Did you go straight from 1.60 to 4.00 without any updates in-between?

I'm on 3.10 but many have said it's sh*t for overclocking and there's still unacceptable vdroop even on the most aggressive LLC1 setting with fixed voltage.

I never tried 1.60 as my board came with newer versions, but I think a lot of performance has been lost with all the microcode updates from everything I've read across multiple forums.

Win 10 has all it's own patches so I'm thinking of downgrading to 1.60 or even earlier to see if overclocking is more stable and better performance since I doubt the risks for a home PC are as scary as the media has made things out to be.
Plus, it seems every other month they find a new vulnerability which tells me that these CPU's are flawed in general and if hacked intel will only look after the corporations and us home users are screwed anyway.

Globespy wrote: What was the reason for updating your BIOS?

Information about Microarchitectural Data Sampling (MDS). See https://support.apple.com/en-us/HT210108
Only security issue, not performance.

Globespy wrote: Did you go straight from 1.60 to 4.00 without any updates in-between?

Yes