diff --git a/firmware/config/boards/proteus/compile_proteus_f4_hardware_QC_special_build.sh b/firmware/config/boards/proteus/compile_proteus_f4_hardware_QC_special_build.sh
index 9a6ecb4cc1..29c987d135 100644
--- a/firmware/config/boards/proteus/compile_proteus_f4_hardware_QC_special_build.sh
+++ b/firmware/config/boards/proteus/compile_proteus_f4_hardware_QC_special_build.sh
@@ -2,7 +2,7 @@
 
 export PROJECT_BOARD=proteus
 export PROJECT_CPU=ARCH_STM32F4
-export EXTRA_PARAMS="-DVR_HW_CHECK_MODE=TRUE -DHW_CHECK_ALWAYS_STIMULATE=TRUE -DHW_CHECK_SPARK_FSIO=TRUE -DSHORT_BOARD_NAME=proteus_f4"
+export EXTRA_PARAMS="-DVR_HW_CHECK_MODE=TRUE -DHW_CHECK_SD=TRUE -DHW_CHECK_ALWAYS_STIMULATE=TRUE -DHW_CHECK_SPARK_FSIO=TRUE -DSHORT_BOARD_NAME=proteus_f4"
 
 export DEFAULT_ENGINE_TYPE=-DDEFAULT_ENGINE_TYPE=PROTEUS_QC_TEST_BOARD
 
diff --git a/firmware/config/boards/proteus/compile_proteus_f7_hardware_QC_special_build.sh b/firmware/config/boards/proteus/compile_proteus_f7_hardware_QC_special_build.sh
index 3f1afefd2d..4cdd294c2d 100644
--- a/firmware/config/boards/proteus/compile_proteus_f7_hardware_QC_special_build.sh
+++ b/firmware/config/boards/proteus/compile_proteus_f7_hardware_QC_special_build.sh
@@ -2,8 +2,7 @@
 
 export PROJECT_BOARD=proteus
 export PROJECT_CPU=ARCH_STM32F7
-
-export EXTRA_PARAMS="-DVR_HW_CHECK_MODE=TRUE -DHW_CHECK_ALWAYS_STIMULATE=TRUE -DHW_CHECK_SPARK_FSIO=TRUE -DSHORT_BOARD_NAME=proteus_f7"
+export EXTRA_PARAMS="-DVR_HW_CHECK_MODE=TRUE -DHW_CHECK_SD=TRUE -DHW_CHECK_ALWAYS_STIMULATE=TRUE -DHW_CHECK_SPARK_FSIO=TRUE -DSHORT_BOARD_NAME=proteus_f7"
 
 export DEFAULT_ENGINE_TYPE=-DDEFAULT_ENGINE_TYPE=PROTEUS_QC_TEST_BOARD
 
diff --git a/firmware/console/status_loop.cpp b/firmware/console/status_loop.cpp
index 29d108ba9b..1de9dac458 100644
--- a/firmware/console/status_loop.cpp
+++ b/firmware/console/status_loop.cpp
@@ -376,6 +376,13 @@ class CommunicationBlinkingTask : public PeriodicTimerController {
 			setAllLeds(0);
 		} else if (counter % 2 == 0) {
 			enginePins.communicationLedPin.setValue(0);
+#if HW_CHECK_SD
+extern int totalLoggedBytes;
+			if (totalLoggedBytes > 50000) {
+				enginePins.communicationLedPin.setValue(1);
+			}
+#endif // HW_CHECK_SD
+
 #if HW_CHECK_MODE
 			// we have to do anything possible to help users notice FACTORY MODE
 			enginePins.errorLedPin.setValue(1);
diff --git a/firmware/controllers/trigger/trigger_central.cpp b/firmware/controllers/trigger/trigger_central.cpp
index d302ac72d6..8d1ce5bbfe 100644
--- a/firmware/controllers/trigger/trigger_central.cpp
+++ b/firmware/controllers/trigger/trigger_central.cpp
@@ -23,6 +23,7 @@
 #include "engine_math.h"
 #include "local_version_holder.h"
 #include "trigger_simulator.h"
+#include "trigger_emulator_algo.h"
 
 #include "rpm_calculator.h"
 #include "tooth_logger.h"
@@ -108,6 +109,7 @@ void hwHandleVvtCamSignal(trigger_value_e front, efitick_t nowNt, int index DECL
 	extern ioportid_t criticalErrorLedPort;
 	extern ioportmask_t criticalErrorLedPin;
 
+
 	for (int i = 0 ; i < 100 ; i++) {
 		// turning pin ON and busy-waiting a bit
 		palWritePad(criticalErrorLedPort, criticalErrorLedPin, 1);
@@ -300,6 +302,11 @@ void hwHandleShaftSignal(trigger_event_e signal, efitick_t timestamp) {
 	extern ioportid_t criticalErrorLedPort;
 	extern ioportmask_t criticalErrorLedPin;
 
+#if HW_CHECK_ALWAYS_STIMULATE
+	disableTriggerStimulator();
+#endif // HW_CHECK_ALWAYS_STIMULATE
+
+
 	for (int i = 0 ; i < 100 ; i++) {
 		// turning pin ON and busy-waiting a bit
 		palWritePad(criticalErrorLedPort, criticalErrorLedPin, 1);
diff --git a/firmware/hw_layer/mmc_card.cpp b/firmware/hw_layer/mmc_card.cpp
index c626d14d6f..ffcaeb0976 100644
--- a/firmware/hw_layer/mmc_card.cpp
+++ b/firmware/hw_layer/mmc_card.cpp
@@ -50,7 +50,7 @@ EXTERN_ENGINE;
 // at about 20Hz we write about 2Kb per second, looks like we flush once every ~2 seconds
 #define F_SYNC_FREQUENCY 10
 
-static int totalLoggedBytes = 0;
+int totalLoggedBytes = 0;
 static int fileCreatedCounter = 0;
 static int writeCounter = 0;
 static int totalWritesCounter = 0;