First things first, ASRock does not recommend updating the BIOS if you're using a Pinnacle Ridge CPU on the system. Your PC uses the AMD Ryzen 5 2600 CPU, which is a Pinnacle Ridge CPU, so I wouldn't recommend updating the BIOS.
Secondly, if you do not already have a copy of the user manual for your motherboard, download it from here
. It comes in handy at time like this (installing memory). It tells you how to handle and install memory modules. Since your motherboard only has two DIMM slots, this should be pretty simple and straightforward. Make sure the system is turned OFF and the power cable is unplugged before inserting a stick OR handling the insides of your PC! Test each module/stick separately, that is, insert one of the new sticks into slot A1 or B1 and power up the system. Make sure to push it in firmly so that it goes all the way in and sits tightly in the slot. It may take a few seconds for the system to register the new ram, so give it at least 30 seconds and see if it POSTs. Also, turn off the monitor and turn it back on to force it to poll its various input channels for video, just in case it is not actively polling them for a signal. If the system will still not POST with either of the new sticks, and will POST just fine with the old stick, then you may have received a bad set. It's highly unlikely that both sticks in the set are bad though. You could also reset the BIOS by removing the CMOS battery for a few seconds after inserting a new stick, then power up and see if the system POSTs. Let us know how it goes.
The new RAM is compatible and featured in the QVL of tested/supported memory here
, so they should work as long as they are NOT defective and are installed properly.