diff --git a/software/firmware/source/SkyWatch/Platform_ESP32.h b/software/firmware/source/SkyWatch/Platform_ESP32.h
index 503e99d02..f209719cc 100644
--- a/software/firmware/source/SkyWatch/Platform_ESP32.h
+++ b/software/firmware/source/SkyWatch/Platform_ESP32.h
@@ -249,8 +249,8 @@ extern PCF8563_Class *rtc;
 
 #undef  SOC_GPIO_PIN_GNSS_RX
 #undef  SOC_GPIO_PIN_GNSS_TX
-#define SOC_GPIO_PIN_GNSS_RX            SOC_GPIO_PIN_TULTIMA_ESP_MOSI
-#define SOC_GPIO_PIN_GNSS_TX            SOC_GPIO_PIN_TULTIMA_ESP_MISO
+#define SOC_GPIO_PIN_GNSS_RX            SOC_GPIO_PIN_TULTIMA_ESP_HS
+#define SOC_GPIO_PIN_GNSS_TX            SOC_GPIO_PIN_TULTIMA_ESP_DR
 
 extern IODev_ops_t ArdBLE_Bluetooth_ops;
 #endif /* CONFIG_IDF_TARGET_ESP32C6 */
diff --git a/software/firmware/source/SoftRF/src/platform/iomap/Heltec_T114.h b/software/firmware/source/SoftRF/src/platform/iomap/Heltec_T114.h
index b0d706a43..8ad437193 100644
--- a/software/firmware/source/SoftRF/src/platform/iomap/Heltec_T114.h
+++ b/software/firmware/source/SoftRF/src/platform/iomap/Heltec_T114.h
@@ -21,9 +21,13 @@
 #define SOC_GPIO_PIN_T114_DIO1      _PINNUM(0, 20) // P0.20
 #define SOC_GPIO_PIN_T114_BUSY      _PINNUM(0, 17) // P0.17
 
-/* I2C */
-#define SOC_GPIO_PIN_T114_SDA       _PINNUM(0, 26) // P0.26
-#define SOC_GPIO_PIN_T114_SCL       _PINNUM(0, 27) // P0.27
+/* I2C int. (same that T-Echo has) */
+#define SOC_GPIO_PIN_T114_SDA_INT   _PINNUM(0, 26) // P0.26
+#define SOC_GPIO_PIN_T114_SCL_INT   _PINNUM(0, 27) // P0.27
+
+/* I2C ext. (air pressure sensor) */
+#define SOC_GPIO_PIN_T114_SDA_EXT   _PINNUM(0, 16) // P0.16
+#define SOC_GPIO_PIN_T114_SCL_EXT   _PINNUM(0, 13) // P0.13
 
 /* button */
 #define SOC_GPIO_PIN_T114_BUTTON    _PINNUM(1, 10) // P1.10
diff --git a/software/firmware/source/SoftRF/src/platform/nRF52.cpp b/software/firmware/source/SoftRF/src/platform/nRF52.cpp
index f7d7ad51f..7d64a89e8 100644
--- a/software/firmware/source/SoftRF/src/platform/nRF52.cpp
+++ b/software/firmware/source/SoftRF/src/platform/nRF52.cpp
@@ -793,7 +793,7 @@ static void nRF52_setup()
     case NRF52_LILYGO_TECHO_REV_1:
     case NRF52_LILYGO_TECHO_REV_2:
     case NRF52_NORDIC_PCA10059:
-    case NRF52_HELTEC_T114:
+    case NRF52_HELTEC_T114: /* internal bus */
     default:
       Wire.setPins(SOC_GPIO_PIN_SDA, SOC_GPIO_PIN_SCL);
       break;
@@ -880,6 +880,10 @@ static void nRF52_setup()
     nRF52_board        = NRF52_HELTEC_T114;
     hw_info.model      = SOFTRF_MODEL_COZY;
     nRF52_Device_Model = "Cozy Edition";
+#if !defined(ARDUINO_ARCH_MBED)
+    /* external bus */
+    Wire.setPins(SOC_GPIO_PIN_T114_SDA_EXT, SOC_GPIO_PIN_T114_SCL_EXT);
+#endif /* ARDUINO_ARCH_MBED */
   }
 #endif /* USE_TFT */
 
@@ -1758,6 +1762,21 @@ static void nRF52_fini(int reason)
       pinMode(SOC_GPIO_PIN_SFL_SS,    INPUT);
       break;
 
+    case NRF52_LILYGO_TULTIMA:
+#if !defined(ARDUINO_ARCH_MBED)
+      if (nRF52_has_extension) {
+        xl9555->pinMode(ExtensionIOXL9555::I2C_EXP_PIN_GNSS_TULTIMA_PWR, INPUT);
+        xl9555->pinMode(ExtensionIOXL9555::I2C_EXP_PIN_SENS_TULTIMA_PWR, INPUT);
+        xl9555->pinMode(ExtensionIOXL9555::I2C_EXP_PIN_LORA_TULTIMA_PWR, INPUT);
+        xl9555->pinMode(ExtensionIOXL9555::I2C_EXP_PIN_WIFI_TULTIMA_PWR, INPUT);
+
+        xl9555->pinMode(ExtensionIOXL9555::I2C_EXP_PIN_MOTOR_TULTIMA_EN, INPUT);
+        xl9555->pinMode(ExtensionIOXL9555::I2C_EXP_PIN_AMP_TULTIMA_EN,   INPUT);
+        xl9555->deinit();
+      }
+#endif /* ARDUINO_ARCH_MBED */
+      break;
+
     case NRF52_NORDIC_PCA10059:
     default:
 //      ledOff(SOC_GPIO_LED_PCA10059_GREEN);