diff --git a/src/ftdiJtagBitbang.cpp b/src/ftdiJtagBitbang.cpp
index e16d1bb..1690fec 100644
--- a/src/ftdiJtagBitbang.cpp
+++ b/src/ftdiJtagBitbang.cpp
@@ -42,14 +42,14 @@ using namespace std;
 
 FtdiJtagBitBang::FtdiJtagBitBang(const FTDIpp_MPSSE::mpsse_bit_config &cable,
 			const jtag_pins_conf_t *pin_conf, string dev, uint32_t clkHZ, bool verbose):
-			FTDIpp_MPSSE(dev, cable.interface, clkHZ, verbose), _bitmode(0), _nb_bit(0)
+			FTDIpp_MPSSE(cable, dev, clkHZ, verbose), _bitmode(0), _nb_bit(0)
 {
 	init_internal(cable, pin_conf);
 }
 
 FtdiJtagBitBang::FtdiJtagBitBang(const FTDIpp_MPSSE::mpsse_bit_config &cable,
 		   const jtag_pins_conf_t *pin_conf, uint32_t clkHZ, bool verbose):
-		   FTDIpp_MPSSE(cable.vid, cable.pid, cable.interface, clkHZ, verbose),
+		   FTDIpp_MPSSE(cable, clkHZ, verbose),
 		   _bitmode(0), _nb_bit(0)
 {
 	init_internal(cable, pin_conf);
diff --git a/src/ftdiJtagMPSSE.cpp b/src/ftdiJtagMPSSE.cpp
index ef017b4..b2e0427 100644
--- a/src/ftdiJtagMPSSE.cpp
+++ b/src/ftdiJtagMPSSE.cpp
@@ -42,14 +42,14 @@ using namespace std;
 
 FtdiJtagMPSSE::FtdiJtagMPSSE(const FTDIpp_MPSSE::mpsse_bit_config &cable,
 			string dev, uint32_t clkHZ, bool verbose):
-			FTDIpp_MPSSE(dev, cable.interface, clkHZ, verbose), _ch552WA(false)
+			FTDIpp_MPSSE(cable, dev, clkHZ, verbose), _ch552WA(false)
 {
 	init_internal(cable);
 }
 
 FtdiJtagMPSSE::FtdiJtagMPSSE(const FTDIpp_MPSSE::mpsse_bit_config &cable,
 		   uint32_t clkHZ, bool verbose):
-		   FTDIpp_MPSSE(cable.vid, cable.pid, cable.interface, clkHZ, verbose),
+		   FTDIpp_MPSSE(cable, clkHZ, verbose),
 		   _ch552WA(false)
 {
 	init_internal(cable);
diff --git a/src/ftdipp_mpsse.cpp b/src/ftdipp_mpsse.cpp
index b8a9e9b..dd1ccee 100644
--- a/src/ftdipp_mpsse.cpp
+++ b/src/ftdipp_mpsse.cpp
@@ -18,14 +18,20 @@ using namespace std;
 #define display(...) \
 	do { if (_verbose) fprintf(stdout, __VA_ARGS__);}while(0)
 
-FTDIpp_MPSSE::FTDIpp_MPSSE(const string &dev, unsigned char interface,
+FTDIpp_MPSSE::FTDIpp_MPSSE(const mpsse_bit_config &cable, const string &dev,
 			   uint32_t clkHZ, bool verbose):_verbose(verbose), _vid(0),
-				_pid(0), _bus(-1), _addr(-1), _product(""), _interface(interface),
+				_pid(0), _bus(-1), _addr(-1), _product(""),
+				_interface(cable.interface),
 				_clkHZ(clkHZ), _buffer_size(2*32768), _num(0)
 {
-	if (!search_with_dev(dev)) {
-		cerr << "No cable found" << endl;
-		throw std::exception();
+	if (!dev.empty()) {
+		if (!search_with_dev(dev)) {
+			cerr << "No cable found" << endl;
+			throw std::exception();
+		}
+	} else {
+		_vid = cable.vid;
+		_pid = cable.pid;
 	}
 
 	open_device(115200);
@@ -38,10 +44,10 @@ FTDIpp_MPSSE::FTDIpp_MPSSE(const string &dev, unsigned char interface,
 	}
 }
 
-FTDIpp_MPSSE::FTDIpp_MPSSE(int vid, int pid, unsigned char interface,
-			   uint32_t clkHZ, bool verbose):_verbose(verbose), _vid(vid),
-			   _pid(pid), _bus(-1),
-			   _addr(-1), _product(""), _interface(interface),
+FTDIpp_MPSSE::FTDIpp_MPSSE(const mpsse_bit_config &cable,
+			   uint32_t clkHZ, bool verbose):_verbose(verbose),
+			   _vid(cable.vid), _pid(cable.pid), _bus(-1),
+			   _addr(-1), _product(""), _interface(cable.interface),
 			   _clkHZ(clkHZ), _buffer_size(2*32768), _num(0)
 {
 	open_device(115200);
@@ -186,6 +192,9 @@ int FTDIpp_MPSSE::init(unsigned char latency, unsigned char bitmask_mode,
 		mpsse_write();
 	}
 
+	ftdi_read_data_set_chunksize(_ftdi, _buffer_size);
+	ftdi_write_data_set_chunksize(_ftdi, _buffer_size);
+
 	return 0;
 }
 
@@ -242,6 +251,7 @@ int FTDIpp_MPSSE::setClkFreq(uint32_t clkHZ, char use_divide_by_5)
         return -1;
     }
 	ret = ftdi_read_data(_ftdi, buffer, 4);
+	ftdi_usb_purge_buffers(_ftdi);
 
     return real_freq;
 }
diff --git a/src/ftdipp_mpsse.hpp b/src/ftdipp_mpsse.hpp
index e8f665b..247ba25 100644
--- a/src/ftdipp_mpsse.hpp
+++ b/src/ftdipp_mpsse.hpp
@@ -5,12 +5,6 @@
 
 class FTDIpp_MPSSE {
 	public:
-		FTDIpp_MPSSE(const std::string &dev, unsigned char interface,
-			uint32_t clkHZ, bool verbose = false);
-		FTDIpp_MPSSE(int vid, int pid, unsigned char interface,
-			uint32_t clkHZ, bool verbose = false);
-		~FTDIpp_MPSSE();
-
 		typedef struct {
 			int vid;
 			int pid;
@@ -21,6 +15,12 @@ class FTDIpp_MPSSE {
 			int bit_high_dir;
 		} mpsse_bit_config;
 
+		FTDIpp_MPSSE(const mpsse_bit_config &cable, const std::string &dev,
+			uint32_t clkHZ, bool verbose = false);
+		FTDIpp_MPSSE(const mpsse_bit_config &cablen,
+			uint32_t clkHZ, bool verbose = false);
+		~FTDIpp_MPSSE();
+
 		int init(unsigned char latency, unsigned char bitmask_mode, unsigned char mode,
 				mpsse_bit_config &bit_conf);
 		int setClkFreq(uint32_t clkHZ);
diff --git a/src/ftdispi.cpp b/src/ftdispi.cpp
index 92baaa6..913defe 100644
--- a/src/ftdispi.cpp
+++ b/src/ftdispi.cpp
@@ -62,11 +62,11 @@ void FtdiSpi::setMode(uint8_t mode)
 }
 
 static FTDIpp_MPSSE::mpsse_bit_config bit_conf =
-	{0x08, 0x0B, 0x08, 0x0B};
+	{0x403, 0x6010, INTERFACE_B, 0x08, 0x0B, 0x08, 0x0B};
 
 FtdiSpi::FtdiSpi(int vid, int pid, unsigned char interface, uint32_t clkHZ,
 	bool verbose):
-	FTDIpp_MPSSE(vid, pid, interface, clkHZ, verbose)
+	FTDIpp_MPSSE(bit_conf, clkHZ, verbose)
 {
 	setCSmode(SPI_CS_AUTO);
 	setEndianness(SPI_MSB_FIRST);
diff --git a/src/jtag.cpp b/src/jtag.cpp
index 0090b6b..97e5372 100644
--- a/src/jtag.cpp
+++ b/src/jtag.cpp
@@ -80,7 +80,7 @@ Jtag::Jtag(cable_t &cable, const jtag_pins_conf_t *pin_conf,
 		   _tms_buffer_size(128), _num_tms(0),
 		   _board_name("nope")
 {
-	init_internal(cable, NULL, pin_conf, clkHZ);
+	init_internal(cable, "", pin_conf, clkHZ);
 }
 
 Jtag::~Jtag()