What i also noted: you can't re-flash a BIOS, which is already the current one flashed. If you try, you will get a message like:
"That version is already flahed and current. Please select a newer BIOS to flash."
I NEVER had this on my ASRock Z270 Super Carrier, nor on my ASRock Z170 Extreme7+. So if you want to re-flash for exaple v3.10 while v3.10 is currently the active BIOS, than you first have to "downgrade" with older BIOS file or "upgrade" with newer BIOS file. Otherwise you won't be able to re-flash the current version. So not only that they changed their "security flash check failed!" routine, it seems, they also implemented a "That BIOS is already flashed and current. Please select a newer file to flash." routine.