Fix partition scheme documentation

Author: nseidle

docs/firmware_update.md

@@ -237,10 +237,14 @@ The SparkFun RTK firmware is compiled using Arduino (currently v1.8.15). To comp
 
 1. Install [Arduino](https://www.arduino.cc/en/software). 
 2. Install ESP32 for Arduino. [Here](https://learn.sparkfun.com/tutorials/esp32-thing-hookup-guide#installing-via-arduino-ide-boards-manager) are some good instructions for installing it via the Arduino Boards Manager. **Note**: Use v2.0.2 of the core. **Note:** We use the 'ESP32 Dev Module' for pin numbering. Select the correct board under Tools->Board->ESP32 Arduino->ESP32 Dev Module.
-3. Change the Partition table. Replace 'C:\Users\\[user name]\AppData\Local\Arduino15\packages\esp32\hardware\esp32\2.0.2\tools\partitions\min_spiffs.csv' with the min_spiff.csv file found in this folder. This will increase the program partition from a maximum of 1.9MB to 3MB.
-4. Set the core settings: The 'Partition Scheme' must be set to 'Minimal SPIFFS (1.9MB APP with OTA/190KB SPIFFS). This will use the 'min_spiffs.csv' updated partition table.
-5. Set the 'Flash Size' to 16MB (128mbit)
-6. Obtain all the required libraries. **Note:** You should click on the link next to each of the #includes at the top of RTK_Surveyor.ino within the Arduino IDE to open the library manager and download them. Getting them directly from Github also works but may not be 'official' releases:
+3. Change the Partition table. Replace 'C:\Users\\[user name]\AppData\Local\Arduino15\packages\esp32\hardware\esp32\2.0.2\tools\partitions\app3M_fat9M_16MB.csv' with the app3M_fat9M_16MB.csv [file](https://github.com/sparkfun/SparkFun_RTK_Firmware/blob/main/Firmware/app3M_fat9M_16MB.csv) found in the [Firmware folder](https://github.com/sparkfun/SparkFun_RTK_Firmware/tree/main/Firmware). This will increase the program partition from a maximum of 1.9MB to 3MB.
+4. From the Arduino IDE, set the core settings from the **Tools** menu: 
+    
+    A. Set the 'Partition Scheme' to *16M Flash (3MB APP/9MB FATFS)*. This will use the 'app3M_fat9M_16MB.csv' updated partition table.
+    
+    B. Set the 'Flash Size' to 16MB (128mbit)
+
+5. Obtain all the required libraries. **Note:** You should click on the link next to each of the #includes at the top of RTK_Surveyor.ino within the Arduino IDE to open the library manager and download them. Getting them directly from Github also works but may not be 'official' releases:
     * [ESP32Time](https://github.com/fbiego/ESP32Time)
     * [ESPAsyncWebServer](https://github.com/me-no-dev/ESPAsyncWebServer) (not available via library manager)
     * [AsyncTCP](https://github.com/me-no-dev/AsyncTCP) (not available via library manager)