According to MSI Support for your motherboard. It does support the Ryzen 7 1700 CPU. Support For A320M GAMING PRO | Motherboard - The world leader in motherboard design | MSI Global
RYZEN 7 | Summit Ridge | YD1700BBM88AE | 1700 | 100 | 3.0 | 4MB | 16MB | B1 | 65 | N/A | 7A39v10.zip |
As long as your Motherboard comes with the minimum BIOS Version 7A39v10, Your Ryzen should be fully supported.
According to the previous BIOS versions at MSI Support, The BIOS Version 7A39v10 seems to be the original BIOS version for your Motherboard. So you should have no problems with the incorrect BIOS for your Ryzen 1700 CPU.
Here is the latest BIOS version for your Motherboard: