Hi guys, I have a similar board the "ASRock Fatal1ty AB350 Gaming-ITX/ac" coupled with a Ryzen 5 1600. It is running the latest Bios 3.00 released on 7/24/2017.
I would say the Bios is pretty spartan, the OC options seem a bit limited, for example when you choose Manual it changes both fields for Frequesncy and voltage, I would of liked to have the voltage kept auto and be able to change it independently, for guidance first at an overclock to be able to see what the mb is setting as voltage first when you modify the frequency.
Secondly seem like the software F-StreamTuning is not able to overclock the processor due to the fact is not an X model, which is strange as all Ryzen's are advertized as unlocked. Also the fan tuning feature is "tuning" the fan attched to cha_fan2, in the end it sets for all percentages the same value ~ 1350 rpm. This makes the noise a bit annoying, especially knowing that the fan was working ok with pwm on the previous board. And due this the cha_fan2 seem to not be able to control the 4 pin pwm fan, it just runs at full speed no mather what setting I select in BIOS FAN Control, "Silent", "Standard", "Performance". Third the cmos reset switch is a bit badly placed as it is completely covered by the videocard so if your overclock breaks the mobo you have to competelly disassemble it in order to reach to it.