diff --git a/M17Defines.h b/M17Defines.h
index 4952fdc..2f8e98e 100644
--- a/M17Defines.h
+++ b/M17Defines.h
@@ -26,13 +26,15 @@ const unsigned int M17_FRAME_LENGTH_BYTES   = M17_FRAME_LENGTH_BITS / 8U;
 
 const unsigned int M17_SYNC_LENGTH_BITS    = 16U;
 
-const uint8_t M17_HEADER_SYNC_BYTES[]      = {0x5DU, 0xDDU};
-const uint8_t M17_DATA_SYNC_BYTES[]        = {0xDDU, 0xDDU};
+const uint8_t M17_LINK_SETUP_SYNC_BYTES[] = {0x55U, 0xF7U};
+const uint8_t M17_STREAM_SYNC_BYTES[]     = {0xFFU, 0x5DU};
+const uint8_t M17_PACKET_SYNC_BYTES[]     = {0x75U, 0xFFU};
 
 const uint8_t M17_SYNC_BYTES_LENGTH = 2U;
 
-const uint16_t M17_HEADER_SYNC_BITS = 0x5DDDU;
-const uint16_t M17_DATA_SYNC_BITS   = 0xDDDDU;
+const uint16_t M17_LINK_SETUP_SYNC_BITS = 0x55F7U;
+const uint16_t M17_STREAM_SYNC_BITS     = 0xFF5DU;
+const uint16_t M17_PACKET_SYNC_BITS     = 0x75FFU;
 
 #endif
 
diff --git a/M17RX.cpp b/M17RX.cpp
index 56405ce..d29d6d8 100644
--- a/M17RX.cpp
+++ b/M17RX.cpp
@@ -72,10 +72,10 @@ void CM17RX::processNone(bool bit)
     m_bitBuffer |= 0x01U;
 
   // Fuzzy matching of the header sync bit sequence
-  if (countBits16(m_bitBuffer ^ M17_HEADER_SYNC_BITS) <= MAX_SYNC_BIT_START_ERRS) {
+  if (countBits16(m_bitBuffer ^ M17_LINK_SETUP_SYNC_BITS) <= MAX_SYNC_BIT_START_ERRS) {
     DEBUG1("M17RX: header sync found in None");
     for (uint8_t i = 0U; i < M17_SYNC_BYTES_LENGTH; i++)
-      m_buffer[i] = M17_HEADER_SYNC_BYTES[i];
+      m_buffer[i] = M17_LINK_SETUP_SYNC_BYTES[i];
 
     m_lostCount = MAX_SYNC_FRAMES;
     m_bufferPtr = M17_SYNC_LENGTH_BITS;
@@ -85,10 +85,10 @@ void CM17RX::processNone(bool bit)
   }
 
   // Fuzzy matching of the data sync bit sequence
-  if (countBits16(m_bitBuffer ^ M17_DATA_SYNC_BITS) <= MAX_SYNC_BIT_START_ERRS) {
+  if (countBits16(m_bitBuffer ^ M17_STREAM_SYNC_BITS) <= MAX_SYNC_BIT_START_ERRS) {
     DEBUG1("M17RX: data sync found in None");
     for (uint8_t i = 0U; i < M17_SYNC_BYTES_LENGTH; i++)
-      m_buffer[i] = M17_DATA_SYNC_BYTES[i];
+      m_buffer[i] = M17_STREAM_SYNC_BYTES[i];
 
     m_lostCount = MAX_SYNC_FRAMES;
     m_bufferPtr = M17_SYNC_LENGTH_BITS;
@@ -113,7 +113,7 @@ void CM17RX::processHeader(bool bit)
   // Only search for a sync in the right place +-2 symbols
   if (m_bufferPtr >= (M17_SYNC_LENGTH_BITS - 2U) && m_bufferPtr <= (M17_SYNC_LENGTH_BITS + 2U)) {
     // Fuzzy matching of the data sync bit sequence
-    if (countBits16(m_bitBuffer ^ M17_HEADER_SYNC_BITS) <= MAX_SYNC_BIT_RUN_ERRS) {
+    if (countBits16(m_bitBuffer ^ M17_LINK_SETUP_SYNC_BITS) <= MAX_SYNC_BIT_RUN_ERRS) {
       DEBUG2("M17RX: found header sync in Data, pos", m_bufferPtr - M17_SYNC_LENGTH_BITS);
       m_lostCount = MAX_SYNC_FRAMES;
       m_bufferPtr = M17_SYNC_LENGTH_BITS;
@@ -150,7 +150,7 @@ void CM17RX::processData(bool bit)
   // Only search for a sync in the right place +-2 symbols
   if (m_bufferPtr >= (M17_SYNC_LENGTH_BITS - 2U) && m_bufferPtr <= (M17_SYNC_LENGTH_BITS + 2U)) {
     // Fuzzy matching of the data sync bit sequence
-    if (countBits16(m_bitBuffer ^ M17_DATA_SYNC_BITS) <= MAX_SYNC_BIT_RUN_ERRS) {
+    if (countBits16(m_bitBuffer ^ M17_STREAM_SYNC_BITS) <= MAX_SYNC_BIT_RUN_ERRS) {
       DEBUG2("M17RX: found data sync in Data, pos", m_bufferPtr - M17_SYNC_LENGTH_BITS);
       m_lostCount = MAX_SYNC_FRAMES;
       m_bufferPtr = M17_SYNC_LENGTH_BITS;
diff --git a/version.h b/version.h
index 043fee8..a19dad5 100644
--- a/version.h
+++ b/version.h
@@ -25,7 +25,7 @@
 #define VER_MAJOR       "1"
 #define VER_MINOR       "5"
 #define VER_REV         "2"
-#define VERSION_DATE    "20201126"
+#define VERSION_DATE    "20201226"
 
 #if defined(ZUMSPOT_ADF7021)
 #define BOARD_INFO      "ZUMspot"