diff --git a/libraries/SrcWrapper/inc/stm32_def.h b/libraries/SrcWrapper/inc/stm32_def.h
index fabc06919b..ad34a8c847 100644
--- a/libraries/SrcWrapper/inc/stm32_def.h
+++ b/libraries/SrcWrapper/inc/stm32_def.h
@@ -6,7 +6,7 @@
  * @brief STM32 core version number
  */
 #define STM32_CORE_VERSION_MAJOR    (0x02U) /*!< [31:24] major version */
-#define STM32_CORE_VERSION_MINOR    (0x0BU) /*!< [23:16] minor version */
+#define STM32_CORE_VERSION_MINOR    (0x0CU) /*!< [23:16] minor version */
 #define STM32_CORE_VERSION_PATCH    (0x00U) /*!< [15:8]  patch version */
 /*
  * Extra label for development:
@@ -14,7 +14,7 @@
  * [1-9]: release candidate
  * F[0-9]: development
  */
-#define STM32_CORE_VERSION_EXTRA    (0x00U) /*!< [7:0]  extra version */
+#define STM32_CORE_VERSION_EXTRA    (0xF0U) /*!< [7:0]  extra version */
 #define STM32_CORE_VERSION          ((STM32_CORE_VERSION_MAJOR << 24U)\
                                         |(STM32_CORE_VERSION_MINOR << 16U)\
                                         |(STM32_CORE_VERSION_PATCH << 8U )\
diff --git a/platform.txt b/platform.txt
index 58d8ca2d6f..0ec0678391 100644
--- a/platform.txt
+++ b/platform.txt
@@ -5,7 +5,7 @@
 # https://arduino.github.io/arduino-cli/latest/platform-specification/
 
 name=STM32 boards groups (Board to be selected from Tools submenu 'Board part number')
-version=2.11.0
+version=2.12.0-dev
 
 
 # Define variables used multiple times in platform file
diff --git a/variants/STM32F7xx/F765Z(G-I)T_F767Z(G-I)T_F777ZIT/variant_NUCLEO_F767ZI.cpp b/variants/STM32F7xx/F765Z(G-I)T_F767Z(G-I)T_F777ZIT/variant_NUCLEO_F767ZI.cpp
index b7edea0f36..c0f7688f94 100644
--- a/variants/STM32F7xx/F765Z(G-I)T_F767Z(G-I)T_F777ZIT/variant_NUCLEO_F767ZI.cpp
+++ b/variants/STM32F7xx/F765Z(G-I)T_F767Z(G-I)T_F777ZIT/variant_NUCLEO_F767ZI.cpp
@@ -171,6 +171,23 @@ extern "C" {
 
 /**
   * @brief  System Clock Configuration
+  *         The system Clock is configured as follow :
+  *            System Clock source            = PLL (HSI)
+  *            SYSCLK(Hz)                     = 216000000
+  *            HCLK(Hz)                       = 216000000
+  *            AHB Prescaler                  = 1
+  *            APB1 Prescaler                 = 4
+  *            APB2 Prescaler                 = 2
+  *            HSE Frequency(Hz)              = 16000000
+  *            PLL_M                          = 8
+  *            PLL_N                          = 216
+  *            PLL_P                          = 2
+  *            PLL_Q                          = 9
+  *            PLLSAI_N                       = 192
+  *            PLLSAI_P                       = 2
+  *            VDD(V)                         = 3.3
+  *            Main regulator output voltage  = Scale1 mode
+  *            Flash Latency(WS)              = 7
   * @param  None
   * @retval None
   */
@@ -186,12 +203,12 @@ WEAK void SystemClock_Config(void)
   __HAL_PWR_VOLTAGESCALING_CONFIG(PWR_REGULATOR_VOLTAGE_SCALE1);
 
   /* Initializes the CPU, AHB and APB busses clocks */
-  RCC_OscInitStruct.OscillatorType = RCC_OSCILLATORTYPE_HSE;
-  RCC_OscInitStruct.HSEState = RCC_HSE_BYPASS;
+  RCC_OscInitStruct.OscillatorType = RCC_OSCILLATORTYPE_HSI;
+  RCC_OscInitStruct.HSIState = RCC_HSI_ON;
   RCC_OscInitStruct.HSICalibrationValue = 16;
   RCC_OscInitStruct.PLL.PLLState = RCC_PLL_ON;
   RCC_OscInitStruct.PLL.PLLSource = RCC_PLLSOURCE_HSI;
-  RCC_OscInitStruct.PLL.PLLM = 4;
+  RCC_OscInitStruct.PLL.PLLM = 8;
   RCC_OscInitStruct.PLL.PLLN = 216;
   RCC_OscInitStruct.PLL.PLLP = RCC_PLLP_DIV2;
   RCC_OscInitStruct.PLL.PLLQ = 9;