diff --git a/platformio_orig.ini b/platformio_orig.ini
index c8962086..c9dc8755 100644
--- a/platformio_orig.ini
+++ b/platformio_orig.ini
@@ -46,7 +46,7 @@ description = Paxcounter is a device for metering passenger flows in realtime. I
 
 [common]
 ; for release_version use max. 10 chars total, use any decimal format like "a.b.c"
-release_version = 3.2.0
+release_version = 3.2.1
 ; DEBUG LEVEL: For production run set to 0, otherwise device will leak RAM while running!
 ; 0=None, 1=Error, 2=Warn, 3=Info, 4=Debug, 5=Verbose
 debug_level = 3
@@ -122,11 +122,15 @@ monitor_filters = time, esp32_exception_decoder, default
 
 [env:ota]
 upload_protocol = custom
+platform = https://github.com/platformio/platform-espressif32.git#feature/arduino-upstream
+platform_packages = framework-arduinoespressif32 @ https://github.com/espressif/arduino-esp32.git#c2e5957
 
 [env:usb]
 upload_protocol = esptool
+platform = https://github.com/platformio/platform-espressif32.git#feature/arduino-upstream
+platform_packages = framework-arduinoespressif32 @ https://github.com/espressif/arduino-esp32.git#c2e5957
 
 [env:dev]
 upload_protocol = esptool
 platform = https://github.com/platformio/platform-espressif32.git#feature/arduino-upstream
-platform_packages = framework-arduinoespressif32 @ https://github.com/espressif/arduino-esp32.git
+platform_packages = framework-arduinoespressif32 @ https://github.com/espressif/arduino-esp32.git#c2e5957
diff --git a/src/i2c.cpp b/src/i2c.cpp
index f12334a8..c908d250 100644
--- a/src/i2c.cpp
+++ b/src/i2c.cpp
@@ -12,7 +12,8 @@ void i2c_init(void) {
   Wire.begin();
 }
 
-void i2c_deinit(void) { Wire.end(); }
+//void i2c_deinit(void) { Wire.end(); }
+void i2c_deinit(void) { Wire.~TwoWire(); }
 
 void i2c_scan(void) {
 
diff --git a/src/paxcounter_orig.conf b/src/paxcounter_orig.conf
index e0f0eb11..2848a42d 100644
--- a/src/paxcounter_orig.conf
+++ b/src/paxcounter_orig.conf
@@ -4,7 +4,9 @@
 //
 // --> adapt to your needs and use case <--
 //
-// Note: After editing, before "build", use "clean" button in PlatformIO!
+// Notes:
+// 1. After editing, before "build", use "clean" button in PlatformIO!
+// 2. Clear NVRAM of the board to delete previous stored runtime settings (pio run -t erase)
 
 // Device options
 #define VERBOSE                         1       // set to 0 to silence the device, 1 enables additional debug output
diff --git a/src/timekeeper.cpp b/src/timekeeper.cpp
index 24c25f9e..32b1e0fe 100644
--- a/src/timekeeper.cpp
+++ b/src/timekeeper.cpp
@@ -33,9 +33,6 @@ void setTimeSyncIRQ() { xTaskNotify(irqHandlerTask, TIMESYNC_IRQ, eSetBits); }
 
 void calibrateTime(void) {
 
-  time_t t = 0;
-  uint16_t t_msec = 0;
-
   // kick off asynchronous lora timesync if we have
 #if (HAS_LORA_TIME)
   timesync_request();
@@ -43,6 +40,10 @@ void calibrateTime(void) {
     return;
 #endif
 
+#if ((HAS_GPS) || (HAS_RTC))
+  time_t t = 0;
+  uint16_t t_msec = 0;
+
 // get GPS time, if we have
 #if (HAS_GPS)
   t = get_gpstime(&t_msec);
@@ -57,6 +58,8 @@ void calibrateTime(void) {
     return;
 #endif
 
+#endif
+
 } // calibrateTime()
 
 // set system time (UTC), calibrate RTC and RTC_INT pps
@@ -250,14 +253,16 @@ void clock_init(void) {
 
 void clock_loop(void *taskparameter) { // ClockTask
 
-  uint64_t ClockPulse = 0;
   uint32_t current_time = 0, previous_time = 0;
-  int8_t ClockMinute = -1;
   time_t tt;
   struct tm t = {0};
 #ifdef HAS_TWO_LED
   static bool led1_state = false;
 #endif
+#ifdef HAS_DCF77
+  uint64_t ClockPulse = 0;
+  int8_t ClockMinute = -1;
+#endif
 
   // output the next second's pulse/telegram after pps arrived
   for (;;) {