diff --git a/armsrc/lfops.c b/armsrc/lfops.c
index a5c4a64d..468f5830 100644
--- a/armsrc/lfops.c
+++ b/armsrc/lfops.c
@@ -642,6 +642,11 @@ void CmdASKsimTag(uint16_t arg1, uint16_t arg2, size_t size, uint8_t *BitStream)
     for (i=0; i<size; i++){
         askSimBit(BitStream[i]^invert, &n, clk, manchester);
     }
+    if (manchester==0 && BitStream[0]==BitStream[size-1]){ //run a second set inverted (for biphase phase)
+        for (i=0; i<size; i++){
+            askSimBit(BitStream[i]^invert^1, &n, clk, manchester);
+        }    
+    }
     if (separator==1) Dbprintf("sorry but separator option not yet available"); 
 
     Dbprintf("Simulating with clk: %d, invert: %d, manchester: %d, separator: %d, n: %d",clk, invert, manchester, separator, n);
diff --git a/client/cmddata.c b/client/cmddata.c
index 0bd8a7a9..e6e4dc0a 100644
--- a/client/cmddata.c
+++ b/client/cmddata.c
@@ -520,6 +520,7 @@ int CmdBiphaseDecodeRaw(const char *Cmd)
 	PrintAndLog("Biphase Decoded using offset: %d - # errors:%d - data:",offset,errCnt);
 	printBitStream(BitStream, size);
 	PrintAndLog("\nif bitstream does not look right try offset=1");
+  if (offset == 1) setDemodBuf(DemodBuffer,DemodBufferLen-1,1);  //remove first bit from raw demod
 	return 1;
 }
 
@@ -534,7 +535,7 @@ void setBiphaseDemodBuf(uint8_t *BitStream, size_t size)
     return;
   }
   for (size_t idx=0; idx<size; idx++){
-    if(BitStream[idx]){
+    if(!BitStream[idx]){
       rawStream[i++] = curPhase;
       rawStream[i++] = curPhase;
       curPhase ^= 1;