docs: rewrite README instructions for setting up

Author: aliphys

README.md

@@ -24,21 +24,49 @@ It allows you to connect to the internet, send and receive SMS messages, and get
 * Send and Receive SMS Messages
 
 ## 👀 Instructions
-1. Insert your Arduino 4G module to the [Arduino Portenta Mid Carrier](https://store.arduino.cc/collections/portenta-family/products/portenta-mid-carrier)
-2. Insert a valid SIM card either in the **PCIE_SIM** connector on the Portenta Mid Carrier
-3. Connect the 5 **SERIAL1** header pins to their corresponding pins on the **PCIE_BREAKOUT** header using jumpers
-![](./docs/header.jpg)
-4. Connect the **3V3 PCIE** pin to the **3V3 Buck** 
-![](./docs/buck.jpg)
-5. Connect external power to the Mid Carrier, via the **VIN** (5V) because modems use a lot of power when connecting or getting a GPS location. Make sure your supply can handle around 3A. 
-6. Get the APN settings from your network operator and add them to the "arduino_secrets.h" file for each sketch
-```cpp
-const char apn[]      = "live.vodafone.com";
-const char gprsUser[] = "live";
-const char gprsPass[] = "";
-```
-7. Install the library and it's dependencies 
-8. Enjoy
+1. Insert a nano SIM card in the **PCIE_SIM** connector on the [Arduino Portenta Mid Carrier](https://docs.arduino.cc/hardware/portenta-mid-carrier/).
+2. Connect the Serial (J17) to the adjacent PCIE Breakout Pins (J16) with jumpers included in the Portenta Mid Carrier:
+    | Serial 1 (J17)         | PCIE Breakout (J16) |
+    |------------------------|---------------------|
+    | RX (Pin 1)             | CK_N (Pin 1)        |
+    | TX (Pin 2)             | CK_P (Pin 3)        |
+    | RTS (Pin 3)            | RX_N (Pin 5)        |
+    | CTS (Pin 4)            | RX_P (Pin 7)        |
+    | mPCIE_GPIO_RST (Pin 5) | mPCIE_RST (Pin 9)   |
+
+3. On J9, using jumpers connect the following pins:
+    | Source (J9)      | Buck Converter (J9) |
+    |------------------|---------------------|
+    | 3V3 PCIE (Pin 1) | 3V3 BUCK (Pin 3)    |
+    | OUT VCC (Pin 2)  | 3V3 BUCK EN (Pin 4) |
+
+4. Insert the [Arduino Pro 4G Module](https://docs.arduino.cc/hardware/pro-4g-module) in the Arduino Mid Carrier.
+
+5. Screw one black post with a white nut from under the Mid Carrier. Using another black post, screw the board to the post. Place two washers on top, and one underneath the Pro 4G Module. So that the board is fixed to the post snuggly and horizontally. 
+
+6. (EMEA and GNSS variants) Connect the cellular antenna (flat antenna in [Arduino Pro 4G Module Antennas Kit](https://store.arduino.cc/products/4g-module-antenna)) to the left microUFL connector marked MAIN.
+
+7. (PRO 4G GNSS only) Connect the GNSS antenna (square antenna in [Arduino Pro 4G Module Antennas Kit](https://store.arduino.cc/products/4g-module-antenna)) to the middle microUFL connector marked GNSS.
+
+8. Insert a [Portenta C33](https://docs.arduino.cc/hardware/portenta-c33) or [Portenta H7](https://docs.arduino.cc/hardware/portenta-h7) Board into the marked location. The USB-C port of the Portenta board should be next to the Ethernet port on the Mid Carrier.
+
+9. Insert a Terminal Block 2-pin > DC female adapter into the screw terminal (J4). Ensure that the negative (-) pin is connected to GND.
+
+10. Use a 5V adapter that can output at least 3A and connect it to the DC female adapter.
+
+11. Connect the Portenta board to your computer using a USB-C cable.
+
+12. Install the `Arduino_Cellular` library and its dependencies
+
+13. Obtain the APN settings from your network operator and add them to the `arduino_secrets.h` file for each sketch. For example:
+    ```cpp
+    #define SECRET_GPRS_APN      "services.telenor.se" // replace with your GPRS APN
+    #define SECRET_GPRS_LOGIN    ""    // replace with your GPRS login
+    #define SECRET_GPRS_PASSWORD "" // replace with your GPRS password
+    ```  
+
+14. Upload sketch to the Portenta board. Enjoy!
+
 
 ## 📖 Documentation