Update reference_documents.md

Author: nseidle

docs/reference_documents.md

@@ -5,7 +5,7 @@ The following datasheets are available for the SparkFun RTK Torch:
 * [RTK Torch Schematic](<https://raw.githubusercontent.com/sparkfun/SparkFun_RTK_Torch/main/Datasheets/RTK_Torch_Schematic_v2.1.pdf>)
 * [ESP32-WROOM-32UE-N16R2 Microcontroller SOM](https://raw.githubusercontent.com/sparkfun/SparkFun_RTK_Torch/main/Datasheets/esp32-wroom-32e_esp32-wroom-32ue_datasheet_en.pdf)
 * [UM980 GNSS Receiver Datasheet](https://raw.githubusercontent.com/sparkfun/SparkFun_RTK_Torch/main/Datasheets/UM980_Datasheet.pdf)
-* [UM980 GNSS Receiver Commands](https://raw.githubusercontent.com/sparkfun/SparkFun_RTK_Torch/main/Datasheets/Unicore_Reference_Commands_Manual_For_N4_High_Precision_Products_V2_EN_R1_1.pdf)
+* [UM980 GNSS Receiver Commands](https://raw.githubusercontent.com/sparkfun/SparkFun_RTK_Torch/main/Datasheets/Unicore Reference Commands Manual For N4 High Precision Products_V2_EN_R1.3)
 * [IM19 Tilt Sensor Integration Guide](https://raw.githubusercontent.com/sparkfun/SparkFun_RTK_Torch/main/Datasheets/IM19_IMU_Tilt_Sensor_IntegrationGuide_v1_3_7.pdf)
 * [IM19 Tilt Sensor Datasheet](https://raw.githubusercontent.com/sparkfun/SparkFun_RTK_Torch/main/IM19_IMU_Tilt_Sensor_v1_1_10.pdf)
 * [MP2762A Charger IC](<https://raw.githubusercontent.com/sparkfun/SparkFun_RTK_Torch/main/Datasheets/MP2762AGV - Charger IC.pdf>)
@@ -15,4 +15,5 @@ The following datasheets are available for the SparkFun RTK Torch:
 * [HUSB238 USB PD Sink Controller Registers](https://raw.githubusercontent.com/sparkfun/SparkFun_RTK_Torch/main/Datasheets/USB_PD_Sink_HUSB238_Registers.pdf)
 * [STM32WLE5CCU6 LoRa capable MCU](https://www.st.com/en/microcontrollers-microprocessors/stm32wle5cc.html)
 * [SKY65313-21 900 MHz Transmit/Receive Front-End Module](https://raw.githubusercontent.com/sparkfun/SparkFun_RTK_Torch/main/Datasheets/SKY65313_21_202121C.pdf)
-
+* [UM980 Firmware v10110](https://raw.githubusercontent.com/sparkfun/SparkFun_RTK_Torch/main/UM980_Firmware/UM980_GSP10110.pkg)
+* [UM980 Firmware v11833](https://raw.githubusercontent.com/sparkfun/SparkFun_RTK_Torch/main/UM980_Firmware/UM980_R4.10Build11833.pkg)