diff --git a/client/cmdsmartcard.c b/client/cmdsmartcard.c
index d97451e47..24803035c 100644
--- a/client/cmdsmartcard.c
+++ b/client/cmdsmartcard.c
@@ -306,7 +306,7 @@ static int smart_wait(uint8_t *data) {
 	return len;
 }
 
-static int smart_response(uint8_t apduINS, uint8_t *data) {
+static int smart_response(uint8_t *data) {
 		
 	int datalen = smart_wait(data);	
 	bool needGetData = false;
@@ -315,12 +315,6 @@ static int smart_response(uint8_t apduINS, uint8_t *data) {
 		goto out;
 	}
 
-	if (datalen > 2 && data[0] != apduINS) {
-		PrintAndLogEx(ERR, "Card ACK error. len=0x%x data[0]=%02x", datalen, data[0]);	
-		datalen = 0;
-		goto out;
-	}
-	
 	if ( data[datalen - 2] == 0x61 || data[datalen - 2] == 0x9F ) {
 		needGetData = true;
 	}
@@ -339,22 +333,26 @@ static int smart_response(uint8_t apduINS, uint8_t *data) {
 		if (datalen < 2 ) {
 			goto out;
 		}
-
-		if (datalen > 2 && data[0] != ISO7816_GETSTATUS) {
-			PrintAndLogEx(ERR, "GetResponse ACK error. len=0x%x data[0]=%02x", len, data[0]);	
-			datalen = 0;
-			goto out;
-		}
 		
-		if (datalen != len + 2 + 1) { // 2 - response, 1 - ACK
-			PrintAndLogEx(WARNING, "GetResponse wrong length. Must be: 0x%02x but: 0x%02x", len, datalen - 3);	
+		// data wo ACK
+		if (datalen != len + 2) { 
+			// data with ACK
+			if (datalen == len + 2 + 1) { // 2 - response, 1 - ACK
+				if (data[0] != ISO7816_GETSTATUS) {
+					PrintAndLogEx(ERR, "GetResponse ACK error. len=0x%x data[0]=%02x", len, data[0]);	
+					datalen = 0;
+					goto out;
+				}
+
+				datalen--;
+				memmove(data, &data[1], datalen);
+			} else {
+				// wrong length
+				PrintAndLogEx(WARNING, "GetResponse wrong length. Must be: 0x%02x but: 0x%02x", len, datalen - 3);	
+			}
 		}
 	}
 	
-	if (datalen > 2) {
-		datalen--;
-		memmove(data, &data[1], datalen);
-	}
 out:
 	return datalen;
 }
@@ -441,7 +439,7 @@ int CmdSmartRaw(const char *Cmd) {
 		if ( !buf )
 			return 1;		
 		
-		int len = smart_response(data[1], buf);
+		int len = smart_response(buf);
 		if ( len < 0 ) {
 			free(buf);
 			return 2;
@@ -453,7 +451,7 @@ int CmdSmartRaw(const char *Cmd) {
 			memcpy(c.d.asBytes, data, sizeof(data) );
 			clearCommandBuffer();
 			SendCommand(&c);
-			len = smart_response(data[1], buf);
+			len = smart_response(buf);
 
 			data[4] = 0;
 		}
@@ -473,15 +471,15 @@ int ExchangeAPDUSC(uint8_t *datain, int datainlen, bool activateCard, bool leave
 		smart_select(false);
 	printf("* APDU SC\n");
 
-	UsbCommand c = {CMD_SMART_RAW, {SC_RAW | SC_CONNECT, datainlen, 0}};	
+	UsbCommand c = {CMD_SMART_RAW, {SC_RAW_T0, datainlen, 0}};	
 	if (activateCard) {
-		c.arg[0] |= SC_SELECT;
+		c.arg[0] |= SC_SELECT | SC_CONNECT;
 	}
 	memcpy(c.d.asBytes, datain, datainlen);
 	clearCommandBuffer();
 	SendCommand(&c);	
 	
-	int len = smart_response(datain[1], dataout);
+	int len = smart_response(dataout);
 	
 	if ( len < 0 ) {
 		return 2;
@@ -489,19 +487,16 @@ int ExchangeAPDUSC(uint8_t *datain, int datainlen, bool activateCard, bool leave
 	
 	// retry
 	if (len > 1 && dataout[len - 2] == 0x6c && datainlen > 4) {
-		UsbCommand c2 = {CMD_SMART_RAW, {SC_RAW, datainlen, 0}};	
-		memcpy(c2.d.asBytes, datain, datainlen);
+		UsbCommand c2 = {CMD_SMART_RAW, {SC_RAW_T0, datainlen, 0}};	
+		memcpy(c2.d.asBytes, datain, 5);
 		
-		int vlen = 5 + datain[4];
-		if (datainlen == vlen)
-			datainlen++;
-		
-		c2.d.asBytes[vlen] = dataout[len - 1];
+		// transfer length via T=0
+		c2.d.asBytes[4] = dataout[len - 1];
 		
 		clearCommandBuffer();
 		SendCommand(&c2);	
 		
-		len = smart_response(datain[1], dataout);
+		len = smart_response(dataout);
 	}	
 	
 	*dataoutlen = len;
@@ -822,7 +817,7 @@ int CmdSmartBruteforceSFI(const char *Cmd) {
 			clearCommandBuffer();
 			SendCommand(&c);
 			
-			smart_response(data[1], buf);
+			smart_response(buf);
 			
 			// if 0x6C
 			if ( buf[0] == 0x6C ) {
@@ -831,7 +826,7 @@ int CmdSmartBruteforceSFI(const char *Cmd) {
 				memcpy(c.d.asBytes, data, sizeof(data) );
 				clearCommandBuffer();
 				SendCommand(&c);
-				uint8_t len = smart_response(data[1], buf);
+				uint8_t len = smart_response(buf);
 				
 				// TLV decoder
 				if (len > 4)
diff --git a/common/i2c.c b/common/i2c.c
index ecf5a5bd9..ea830a1bd 100644
--- a/common/i2c.c
+++ b/common/i2c.c
@@ -698,14 +698,14 @@ void SmartCardRaw( uint64_t arg0, uint64_t arg1, uint8_t *data ) {
 		}
 	}
 
-	if ((flags & SC_RAW)) {
+	if ((flags & SC_RAW) || (flags & SC_RAW_T0)) {
 		
 		LogTrace(data, arg1, 0, 0, NULL, true);
 		
 		// Send raw bytes
 		// asBytes = A0 A4 00 00 02
 		// arg1 = len 5
-		bool res = I2C_BufferWrite(data, arg1, I2C_DEVICE_CMD_SEND, I2C_DEVICE_ADDRESS_MAIN);
+		bool res = I2C_BufferWrite(data, arg1, ((flags & SC_RAW_T0) ? I2C_DEVICE_CMD_SEND_T0 : I2C_DEVICE_CMD_SEND), I2C_DEVICE_ADDRESS_MAIN);
 		if ( !res && MF_DBGLEVEL > 3 ) DbpString(I2C_ERROR);		
 		
 		// read bytes from module
diff --git a/common/i2c.h b/common/i2c.h
index 8350029bd..e5ff26e4d 100644
--- a/common/i2c.h
+++ b/common/i2c.h
@@ -17,6 +17,7 @@
 #define I2C_DEVICE_CMD_SETBAUD		0x04
 #define I2C_DEVICE_CMD_SIM_CLC		0x05
 #define I2C_DEVICE_CMD_GETVERSION	0x06
+#define I2C_DEVICE_CMD_SEND_T0		0x07
 
 
 void I2C_recovery(void);
diff --git a/include/mifare.h b/include/mifare.h
index 63cdf0fb6..cda7cfe9d 100644
--- a/include/mifare.h
+++ b/include/mifare.h
@@ -109,7 +109,8 @@ typedef enum SMARTCARD_COMMAND {
 	SC_CONNECT = 			(1 << 0),
 	SC_NO_DISCONNECT =		(1 << 1),
 	SC_RAW =				(1 << 2),
-	SC_SELECT =				(1 << 3)
+	SC_SELECT =				(1 << 3),
+	SC_RAW_T0 =				(1 << 4),
 } smartcard_command_t;
 
 //-----------------------------------------------------------------------------