diff --git a/client/cmddata.c b/client/cmddata.c
index 146d30ba7..dfa15f598 100644
--- a/client/cmddata.c
+++ b/client/cmddata.c
@@ -615,17 +615,20 @@ int Cmdmandecoderaw(const char *Cmd) {
     return 1;
 }
 
-//by marshmellow
-//biphase decode
-//take 01 or 10 = 0 and 11 or 00 = 1
-//takes 2 arguments "offset" default = 0 if 1 it will shift the decode by one bit
-// and "invert" default = 0 if 1 it will invert output
-//  the argument offset allows us to manually shift if the output is incorrect - [EDIT: now auto detects]
+/*
+ *  @author marshmellow
+ * biphase decode
+ * decodes 01 or 10 -> ZERO 
+ *         11 or 00 -> ONE
+ * param offset adjust start position
+ * param invert invert output
+ * param masxErr maximum tolerated errors 
+ */
 int CmdBiphaseDecodeRaw(const char *Cmd) {
     size_t size = 0;
     int offset = 0, invert = 0, maxErr = 20, errCnt = 0;
     char cmdp = tolower(param_getchar(Cmd, 0));
-    if (strlen(Cmd) > 3 || cmdp == 'h') return usage_data_biphaserawdecode();
+    if (strlen(Cmd) > 5 || cmdp == 'h') return usage_data_biphaserawdecode();
 
     sscanf(Cmd, "%i %i %i", &offset, &invert, &maxErr);
     if (DemodBufferLen == 0) {
@@ -665,7 +668,7 @@ int CmdBiphaseDecodeRaw(const char *Cmd) {
 // - ASK Demod then Biphase decode GraphBuffer samples
 int ASKbiphaseDemod(const char *Cmd, bool verbose) {
     //ask raw demod GraphBuffer first
-    int offset = 0, clk = 0, invert = 0, maxErr = 0;
+    int offset = 0, clk = 0, invert = 0, maxErr = 100;
     sscanf(Cmd, "%i %i %i %i", &offset, &clk, &invert, &maxErr);
 
     uint8_t BitStream[MAX_DEMOD_BUF_LEN];
diff --git a/client/cmdlffdx.c b/client/cmdlffdx.c
index bc1f1e9dc..972ef9627 100644
--- a/client/cmdlffdx.c
+++ b/client/cmdlffdx.c
@@ -160,7 +160,7 @@ int getFDXBits(uint64_t national_id, uint16_t country, uint8_t isanimal, uint8_t
 int CmdFDXBdemodBI(const char *Cmd) {
 
     int clk = 32;
-    int invert = 1, errCnt = 0, offset = 0, maxErr = 0;
+    int invert = 1, errCnt = 0, offset = 0, maxErr = 100;
     uint8_t bs[MAX_DEMOD_BUF_LEN];
     size_t size = getFromGraphBuf(bs);
 
@@ -236,7 +236,7 @@ int CmdFdxDemod(const char *Cmd) {
 
     //Differential Biphase / di-phase (inverted biphase)
     //get binary from ask wave
-    if (!ASKbiphaseDemod("0 32 1 0", false)) {
+    if (!ASKbiphaseDemod("0 32 1 100", false)) {
         PrintAndLogEx(DEBUG, "DEBUG: Error - FDX-B ASKbiphaseDemod failed");
         return 0;
     }