Legacy boards often require a specific BIOS setting to enable "Legacy USB Support." The manual references the exact BIOS menu tree (e.g., Integrated Peripherals > OnChip USB Controller > V1.1 + V2.0 ).
For pinout details and layout specifications, refer to Shenzhen Angxun Technology . x7-v124 motherboard manual pdf
Because these boards are often produced by white-label manufacturers in China (like Shenzhen Angxun Technology ), you can often find community-maintained documentation or detailed photos on sites like The Retro Web which list BIOS updates and basic board diagrams. Legacy boards often require a specific BIOS setting