Random connection loss for monitor and peripheral

Good! This means there is P3.30 you haven't tested yet!

Here is what I believe to be (encouraging, yes?) the right DOS flash procedure. I highly recommend you DON'T skip any step(s).

Download ftp://europe.asrock.com/BIOS/AM4/AB350M%20Pro4(3.30)WIN.zip
Download https://rufus.akeo.ie/downloads/rufus-2.18p.exe
Use RUFUS to make a DOS bootable USB
Copy the extracted contents from the UEFI file onto the USB
Clear CMOS and reboot
Enter UEFI!!!
Boot from the USB
Run the .exe
Reboot
Clear CMOS and reboot
Tweak the UEFI settings if you like (XMP, CSM disable, etc.)
Install Win 10
Profit?

It may sound a little long, but that's how I'd do it at least. You could also wait for someone else's input on this. There may be a better way.

Nirmelraj wrote: @zlobster Since i'm from Asia, I should be downloading the Global version of the bios update file, correct? So if I have to reinstall Windows, it means that the data on my HDD and SDD will be wiped out?

UEFI files should be the same, no matter where you're downloading them from.

Depending on your current partitioning there is a chance you'll lose all data on the hard drives. As a general rule, use the SSD for Win & programs, leave the HDD for file storage, e.g. music, movies, etc.

When re-installing Win it's always a good choice to delete all previous partitions on the SSD, and then let Win plop itself there comfortably.