If the motherboard was purchased recently, then there's a good chance it supports the Ryzen 5 2200G APU. According to Gigabyte's support site, the Raven Ridge APUs have been supported since BIOS version F10 (1 Dec 2017). The current version is F22 (16 Mar 2018).
If the currently installed BIOS is older than version F10, then it does not support the APU. It does support the Ryzen 1000 series CPUs (Ryzen 7 1800X, Ryzen 3 1200, etc.), and you could use one of those to boot up and flash to the latest BIOS.
Gigabyte provides 2 main ways to update the BIOS (UEFI). The first is called "Q-Flash" where you put the files on a USB drive, boot into the BIOS setup, and use the Q-Flash utility that is built into the BIOS setup. The second method "@BIOS" is a Windows application, so it requires Windows to be installed already. It can connect to Gigabyte's servers, download the latest BIOS, and execute the flash.