diff --git a/firmware/console/binary/tunerstudio_io.cpp b/firmware/console/binary/tunerstudio_io.cpp
index caa8e96342..6d4a630986 100644
--- a/firmware/console/binary/tunerstudio_io.cpp
+++ b/firmware/console/binary/tunerstudio_io.cpp
@@ -236,7 +236,7 @@ int sr5ReadData(ts_channel_s *tsChannel, uint8_t * buffer, int size) {
 }
 #endif // EFI_PROD_CODE || EFI_SIMULATOR
 
-static void sr5WriteCrcPacketSmall(ts_channel_s* tsChannel, uint8_t responseCode, const uint8_t* buf, size_t size) {
+void sr5WriteCrcPacketSmall(ts_channel_s* tsChannel, uint8_t responseCode, const uint8_t* buf, size_t size) {
 	auto scratchBuffer = tsChannel->scratchBuffer;
 
 	// don't transmit too large a buffer
@@ -265,7 +265,7 @@ static void sr5WriteCrcPacketSmall(ts_channel_s* tsChannel, uint8_t responseCode
 	sr5WriteData(tsChannel, reinterpret_cast<uint8_t*>(scratchBuffer), size + 7);
 }
 
-static void sr5WriteCrcPacketLarge(ts_channel_s* tsChannel, uint8_t responseCode, const uint8_t* buf, size_t size) {
+void sr5WriteCrcPacketLarge(ts_channel_s* tsChannel, uint8_t responseCode, const uint8_t* buf, size_t size) {
 	uint8_t headerBuffer[3];
 	uint8_t crcBuffer[4];
 
diff --git a/firmware/console/binary/tunerstudio_io.h b/firmware/console/binary/tunerstudio_io.h
index 662cd9e566..0abb3d2238 100644
--- a/firmware/console/binary/tunerstudio_io.h
+++ b/firmware/console/binary/tunerstudio_io.h
@@ -50,6 +50,8 @@ bool stopTsPort(ts_channel_s *tsChannel);
 #define SR5_READ_TIMEOUT TIME_MS2I(1000)
 
 void sr5WriteData(ts_channel_s *tsChannel, const uint8_t * buffer, int size);
+void sr5WriteCrcPacketSmall(ts_channel_s* tsChannel, uint8_t responseCode, const uint8_t* buf, size_t size);
+void sr5WriteCrcPacketLarge(ts_channel_s* tsChannel, uint8_t responseCode, const uint8_t* buf, size_t size);
 void sr5WriteCrcPacket(ts_channel_s *tsChannel, uint8_t responseCode, const uint8_t* buf, size_t size);
 void sr5SendResponse(ts_channel_s *tsChannel, ts_response_format_e mode, const uint8_t * buffer, int size);
 void sendOkResponse(ts_channel_s *tsChannel, ts_response_format_e mode);
diff --git a/unit_tests/tests/test_tunerstudio.cpp b/unit_tests/tests/test_tunerstudio.cpp
index f9a5a897e5..382bf0ddc3 100644
--- a/unit_tests/tests/test_tunerstudio.cpp
+++ b/unit_tests/tests/test_tunerstudio.cpp
@@ -4,14 +4,12 @@
 extern int sr5TestWriteDataIndex;
 extern uint8_t st5TestBuffer[16000];
 
-TEST(binary, testWriteCrc) {
-	sr5TestWriteDataIndex = 0;
 
 #define CODE 2
 #define PAYLOAD "123"
 #define SIZE strlen(PAYLOAD)
 
-	sr5WriteCrcPacket(nullptr, CODE, (const uint8_t * )PAYLOAD, SIZE);
+static void assertCrcPacket() {
 	ASSERT_EQ(sr5TestWriteDataIndex, SIZE + 7);
 
 	// todo: proper uint16 comparison
@@ -28,6 +26,21 @@ TEST(binary, testWriteCrc) {
 	ASSERT_EQ(st5TestBuffer[7], 68);
 	ASSERT_EQ(st5TestBuffer[8], 173);
 	ASSERT_EQ(st5TestBuffer[9], 87);
+}
 
 
+TEST(binary, testWriteCrc) {
+
+	sr5TestWriteDataIndex = 0;
+	sr5WriteCrcPacket(nullptr, CODE, (const uint8_t * )PAYLOAD, SIZE);
+	assertCrcPacket();
+
+	sr5TestWriteDataIndex = 0;
+	sr5WriteCrcPacketLarge(nullptr, CODE, (const uint8_t * )PAYLOAD, SIZE);
+	assertCrcPacket();
+
+	sr5TestWriteDataIndex = 0;
+//	sr5WriteCrcPacketSmall(nullptr, CODE, (const uint8_t * )PAYLOAD, SIZE);
+//	assertCrcPacket();
+
 }