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:Version
2018-10-01File Size10.38 MBDescription
- Improve compatibility for AMD Athlon 200GE processor with RADEON VEGA GRAPHICSNote
- MSI strongly recommend to update AMD chipset driver 18.40xxxxxxx or latest version before update BIOS.
Before updating to the latest BIOS Version, the "NOTE" mentions to first update the Motherboard's CHIPSET:
Here is the latest MSI AMD CHIPSET for your motherboard: Support For A320M GAMING PRO | Motherboard - The world leader in motherboard design | MSI Global
System & Chipset DriversTitleAMD Chipset DriverVersion
722.72 MBNoteInclude AMD SMBus Driver、AMD Graphics Driver.