Update software_overview.md

Author: PaulZC

docs/software_overview.md

@@ -435,7 +435,7 @@ The format of the **Print conditions** CSV data is:
 
 ## :fontawesome-solid-screwdriver-wrench: Firmware Upgrade
 
-The **[/Firmware/Binaries](https://github.com/sparkfun/SparkFun_GNSSDO/tree/main/Firmware/Binaries)** folder contains the firmware binaries. v2.0 is the latest stable release - as at 11-5-25.
+The **[/Firmware/Binaries](https://github.com/sparkfun/SparkFun_GNSSDO/tree/main/Firmware/Binaries)** folder contains the firmware binaries. v2.1 is the latest stable release - as at 11-27-25.
 
 You can update or reload the firmware using the [SparkFun RTK Firmware Uploader](https://github.com/sparkfun/SparkFun_RTK_Firmware_Uploader).