diff --git a/DCC.cpp b/DCC.cpp
index 0674fce..70f30e2 100644
--- a/DCC.cpp
+++ b/DCC.cpp
@@ -357,8 +357,9 @@ const ackOp FLASH WRITE_BYTE_PROG[] = {
       
 const ackOp FLASH VERIFY_BYTE_PROG[] = {
       BASELINE,
+      BIV,         // ackManagerByte initial value
       VB,WACK,     // validate byte 
-      ITCB,       // if ok callback value
+      ITCB,       // if ok callback value	
       STARTMERGE,    //clear bit and byte values ready for merge pass
       // each bit is validated against 0 and the result inverted in MERGE
       // this is because there tend to be more zeros in cv values than ones.  
@@ -376,7 +377,7 @@ const ackOp FLASH VERIFY_BYTE_PROG[] = {
       V0, WACK, MERGE,
       V0, WACK, MERGE,
       V0, WACK, MERGE,
-      VB, WACK, ITCB,  // verify merged byte and return it if acked ok 
+      VB, WACK, ITCBV,  // verify merged byte and return it if acked ok - with retry report
       FAIL };
       
       
@@ -688,11 +689,13 @@ int DCC::nextLoco = 0;
 ackOp  const *  DCC::ackManagerProg;
 ackOp  const *  DCC::ackManagerProgStart;
 byte   DCC::ackManagerByte;
+byte   DCC::ackManagerByteVerify;
 byte   DCC::ackManagerStash;
 int    DCC::ackManagerWord;
 byte   DCC::ackManagerRetry;
 byte   DCC::ackRetry = 2;
 int16_t  DCC::ackRetrySum;
+int16_t  DCC::ackRetryPSum;
 int    DCC::ackManagerCv;
 byte   DCC::ackManagerBitNum;
 bool   DCC::ackReceived;
@@ -728,6 +731,7 @@ void  DCC::ackManagerSetup(int cv, byte byteValueOrBitnum, ackOp const program[]
   ackManagerProgStart = program;
   ackManagerRetry = ackRetry;
   ackManagerByte = byteValueOrBitnum;
+  ackManagerByteVerify = byteValueOrBitnum;
   ackManagerBitNum=byteValueOrBitnum;
   ackManagerCallback = callback;
 }
@@ -827,7 +831,18 @@ void DCC::ackManagerLoop() {
             return;
           }
         break;
-
+		    
+      case ITCBV:   // If True callback(byte) - Verify
+          if (ackReceived) {
+            if (ackManagerByte == ackManagerByteVerify) {
+               ackRetrySum ++;
+               LCD(1, F("v %d %d Sum=%d"), ackManagerCv, ackManagerByte, ackRetrySum);
+            }
+            callback(ackManagerByte);
+            return;
+          }
+        break;
+		    
       case ITCB7:   // If True callback(byte & 0x7F)
           if (ackReceived) {
             callback(ackManagerByte & 0x7F);
@@ -845,7 +860,11 @@ void DCC::ackManagerLoop() {
       case FAIL:  // callback(-1)
            callback(-1);
            return;
-           
+
+      case BIV:     // ackManagerByte initial value
+           ackManagerByte = ackManagerByteVerify;
+           break;
+
       case STARTMERGE:
            ackManagerBitNum=7;
            ackManagerByte=0;     
@@ -914,7 +933,7 @@ void DCC::callback(int value) {
     // check for automatic retry
     if (value == -1 && ackManagerRetry > 0) {
       ackRetrySum ++;
-      LCD(0, F("RETRY %d %d %d %d"), ackManagerCv, ackManagerRetry, ackRetry, ackRetrySum);
+      LCD(0, F("Retry %d %d Sum=%d"), ackManagerCv, ackManagerRetry, ackRetrySum);
       ackManagerRetry --;
       ackManagerProg = ackManagerProgStart;
       return;
diff --git a/DCC.h b/DCC.h
index cf1680f..8cb5d97 100644
--- a/DCC.h
+++ b/DCC.h
@@ -38,9 +38,11 @@ enum ackOp : byte
   ITC1,             // If True Callback(1)  (if prevous WACK got an ACK)
   ITC0,             // If True callback(0);
   ITCB,             // If True callback(byte)
+  ITCBV,            // If True callback(byte) - end of Verify Byte
   ITCB7,            // If True callback(byte &0x7F)
   NAKFAIL,          // if false callback(-1)
   FAIL,             // callback(-1)
+  BIV,              // Set ackManagerByte to initial value for Verify retry
   STARTMERGE,       // Clear bit and byte settings ready for merge pass
   MERGE,            // Merge previous wack response with byte value and decrement bit number (use for readimng CV bytes)
   SETBIT,           // sets bit number to next prog byte
@@ -115,9 +117,11 @@ public:
   static inline void setGlobalSpeedsteps(byte s) {
     globalSpeedsteps = s;
   };
-  static inline void setAckRetry(byte retry) {
+  static inline int16_t setAckRetry(byte retry) {
     ackRetry = retry;
+    ackRetryPSum = ackRetrySum;
     ackRetrySum = 0;  // reset running total
+    return ackRetryPSum;
   };
 
 private:
@@ -149,11 +153,13 @@ private:
   static ackOp const *ackManagerProg;
   static ackOp const *ackManagerProgStart;
   static byte ackManagerByte;
+  static byte ackManagerByteVerify;
   static byte ackManagerBitNum;
   static int ackManagerCv;
   static byte ackManagerRetry;
   static byte ackRetry;
   static int16_t ackRetrySum;
+  static int16_t ackRetryPSum;
   static int ackManagerWord;
   static byte ackManagerStash;
   static bool ackReceived;
diff --git a/DCCEXParser.cpp b/DCCEXParser.cpp
index 91039f7..d09aa1b 100644
--- a/DCCEXParser.cpp
+++ b/DCCEXParser.cpp
@@ -820,8 +820,7 @@ bool DCCEXParser::parseD(Print *stream, int16_t params, int16_t p[])
 	      LCD(0, F("Ack Max=%dus"), p[2]);  //   <D ACK MAX 9000>
 	    } else if (p[1] == HASH_KEYWORD_RETRY) {
 	      if (p[2] >255) p[2]=3;
-              DCC::setAckRetry(p[2]);
-	      LCD(0, F("Ack Retry=%d"), p[2]);  //   <D ACK RETRY 2>
+	      LCD(0, F("Ack Retry=%d Sum=%d"), p[2], DCC::setAckRetry(p[2]));  //   <D ACK RETRY 2>
 	    }
 	} else {
 	  StringFormatter::send(stream, F("Ack diag %S\n"), onOff ? F("on") : F("off"));