diff --git a/README.md b/README.md
index 4f3aca7..f1e44b3 100644
--- a/README.md
+++ b/README.md
@@ -47,6 +47,7 @@ first.
 * [Appendix D: Official Expansion Cards](X16%20Reference%20-%20Appendix%20D%20-%20Official%20Expansion%20Cards.md#appendix-d-official-expansion-cards)
 * [Appendix E: Diagnostic Bank](X16%20Reference%20-%20Appendix%20E%20-%20Diagnostic%20Bank.md#appendix-e-diagnostic-bank)
 * [Appendix F: The 65C816 Processor](X16%20Reference%20-%20Appendix%20F%20-%2065C816%20Processor.md#appendix-f-the-65c816-processor)
+* [Appendix G: SMC Recovery with Mac OS](X16%20Reference%20-%20Appendix%20G%20-%20SMC%20Update%20and%20Recovery.md)
 
 ## External Links
 
diff --git a/X16 Reference - 15 - Upgrade Guide.md b/X16 Reference - 15 - Upgrade Guide.md
index abaddf8..bd49d8f 100644
--- a/X16 Reference - 15 - Upgrade Guide.md	
+++ b/X16 Reference - 15 - Upgrade Guide.md	
@@ -35,7 +35,7 @@ TODO: link to instructions for each solution in the matrix
 | Commander X16 | - | - | - | - |
 | USBtinyISP | arduino | arduino | arduino | - |
 | XGecu TL866II+ | Xgpro | - | - | - |
-| XGecu TL866-3G / T48 | Xgpro | - | - | - |
+| XGecu TL866-3G / T48 | Xgpro | - | [minipro](X16%20Reference%20-%20Appendix%20G%20-%20SMC%20Update%20and%20Recovery.md) | - |
 
 ## VERA 
 
diff --git a/X16 Reference - Appendix G - SMC Update and Recovery.md b/X16 Reference - Appendix G - SMC Update and Recovery.md
new file mode 100644
index 0000000..f54feae
--- /dev/null
+++ b/X16 Reference - Appendix G - SMC Update and Recovery.md	
@@ -0,0 +1,56 @@
+# Appendix G: SMC Update and Recovery
+
+**Target Component:** SMC (ATtiny861A)  
+**Programmer:** TL866 series (including TL866-3G/T48)  
+**Software:** minipro ver 0.7  
+
+### Installing the minipro Command Line Utility
+
+This update procedure was tested with minipro ver 0.7.
+
+For a complete list of minipro installation alternatives, visit the [minipro GitLab page](https://gitlab.com/DavidGriffith/minipro).
+
+
+### Downloading SMC Firmware
+
+Use only the official releases of the SMC firmware, which can be found on the [X16 Community GitHub page](https://github.com/X16Community/x16-smc/releases).
+
+Download the firmware in Intel hex file format, such as SMC-47.0.0-firmware_with_bootloader.hex. Note that the .bin file cannot be used for the update described here.
+
+### Creating a Fuses Config File
+
+Create a file named fuses.cfg with the following content:
+
+```
+lfuse = 0xf1
+hfuse = 0xd4
+efuse = 0xfe
+lock = 0xff
+```
+
+Do not alter the content of this config file.
+
+### Programming the SMC
+
+1. Power Off the Board: Ensure that the board is disconnected from mains power.
+
+2. Remove the SMC: The SMC (ATtiny861A) needs to be removed from the X16 board.
+Note the orientation of the SMC, marked by a small notch near pin 1.
+Carefully remove the SMC using a chip puller or a non-scratching prying tool.
+It is recommended to use an anti-static wristband during the removal and reinstallation of the SMC.
+
+3. Program the SMC: 
+
+* Place the SMC in the TL866 series programmer.
+
+* Connect the programmer's USB cable to your computer.
+
+* Run the following command to program the SMC:
+```
+minipro -p ATTINY861@DIP20 -c config -w fuses.cfg -c code -w firmware_with_bootloader.hex
+```
+
+4. Reinstall the SMC: Remove the SMC from the programmer and reinstall it on the X16 board, ensuring it is oriented the same way as before.
+
+5. Test the SMC: Reconnect mains power to the board. Press the Power button to verify if the board works correctly.
+