diff --git a/esp_guide.md b/esp_guide.md
index 3f7017d..4aa9a32 100644
--- a/esp_guide.md
+++ b/esp_guide.md
@@ -14,10 +14,15 @@ Full Documentation at: `https://docs.espressif.com/projects/esp-at/en/latest/esp
 1. Clone ESP-AT v2.4.0.0: `git clone -b v2.4.0.0 --recursive https://github.com/espressif/esp-at.git`  
 2. Change to the repository directory: `cd esp-at`  
 3. `./build.py install` -> Select Platform: ESP32 (Option 1) -> Select Module: WROOM-32 (Option 1) -> Select Silence Mode (Option 1)  
-4. `./build.py menuconfig` -> (Top) -> Compiler options -> Optimization Level -> Enable (X) Optimize for size (-Os)  
-                           -> (Top) -> Component config -> AT -> Disable [ ] AT ble command support.  
-                           -> (Top) -> Component config -> AT -> Disable [ ] AT ble hid command support.  
-                           -> (Top) -> Component config -> AT -> Disable [ ] AT blufi command support.  
-                           -> (Top) -> Component config -> AT -> Disable [ ] AT bt command support.  
-5. `./build.py build`  
-6. `./build.py -p (PORT) flash` (replace PORT with your serial port name, for example `/dev/ttyACM0`)  
+4. `./build.py menuconfig`  
+   -> (Top) -> Compiler options -> Optimization Level -> Enable (X) Optimize for size (-Os)  
+   -> (Top) -> Component config -> AT -> Disable [ ] AT ble command support.  
+   -> (Top) -> Component config -> AT -> Disable [ ] AT ble hid command support.  
+   -> (Top) -> Component config -> AT -> Disable [ ] AT blufi command support.  
+   -> (Top) -> Component config -> AT -> Disable [ ] AT bt command support.  
+6. Modify AT Command Port Pins to UART0  
+   (`https://docs.espressif.com/projects/esp-at/en/latest/esp32/Compile_and_Develop/How_to_set_AT_port_pin.html#modify-command-port-pins`)  
+   -> Edit `components/customized_partitions/raw_data/factory_param/factory_param_data.csv`  
+   -> Set PLATFORM_ESP32 WROOM-32 `uart_port: 0`, `uart_tx_pin: 22`, `uart_rx_pin: 23`, `uart_cts_pin: -1`, `uart_rts_pin: -1`  
+8. `./build.py build`  
+9. `./build.py -p (PORT) flash` (replace PORT with your serial port name, for example `/dev/ttyACM0`)