Before downloading drivers, you must understand what you own. Confusion between the (legacy SiRF Star III), the BU-353S4 (current SiRF Star IV), and clones is the #1 reason for driver failure.
Why? Because the chip inside the BU-353S4 (which converts USB to old-school serial data) was blacklisted by Microsoft in 2020 due to counterfeit chips flooding the market. Windows 11 refuses to load the old v3.3.2 driver out of the box. G Star Iv Gps Driver Download Bu-353s4 Windows 11