As a footnote: {most users} unless you're having a 'problem' that's not Windows related then don't Flash your BIOS. Flashing a BIOS can take a perfectly running system and 'create' a problem, and worst if you mess-up you can 'brick' {ruin} your MOBO. BIOS recovery is extremely difficult.
In short, if you have no problems then my best advice is NOT to flash.
Examples 'when to flash':
1. CPU requires newer BIOS version
2. Non-OS Instability
3. Peripherals e.g. 2TB HDD requires new BIOS.
4. Memory compatibility ; where current RAM is causing errors or stability.