diff --git a/drivers/bsl.c b/drivers/bsl.c
index c2fa678..0d4c11c 100644
--- a/drivers/bsl.c
+++ b/drivers/bsl.c
@@ -364,7 +364,8 @@ static device_t bsl_open(const struct device_args *args)
 	if (args->flags & DEVICE_FLAG_TTY)
 		dev->serial = comport_open(args->path, 460800);
 	else
-		dev->serial = ti3410_open(args->path, args->requested_serial);
+		dev->serial = ti3410_open(args->path, args->requested_serial,
+				(args->flags & DEVICE_FLAG_HAS_VID_PID), args->vid, args->pid);
 
 	if (!dev->serial) {
 		free(dev);
diff --git a/drivers/device.h b/drivers/device.h
index 2ac099d..14c0654 100644
--- a/drivers/device.h
+++ b/drivers/device.h
@@ -75,6 +75,7 @@ struct device_breakpoint {
 #define DEVICE_FLAG_DO_FWUPDATE 0x10
 #define DEVICE_FLAG_SKIP_CLOSE	0x20
 #define DEVICE_FLAG_BSL_NME     0x40 /* BSL no-mass-erase */
+#define DEVICE_FLAG_HAS_VID_PID 0x80
 
 struct device_args {
 	int			flags;
@@ -88,6 +89,7 @@ struct device_args {
 	int			bsl_gpio_rts;
 	int			bsl_gpio_dtr;
 	uint8_t                 bsl_entry_password[32];
+	uint16_t vid, pid;
 };
 
 struct device_class {
diff --git a/drivers/fet.c b/drivers/fet.c
index 51a03f2..0309b11 100644
--- a/drivers/fet.c
+++ b/drivers/fet.c
@@ -44,9 +44,11 @@ static device_t fet_open_rf2500(const struct device_args *args)
 	}
 
 #if defined(__APPLE__)
-	trans = rf2500hidapi_open(args->path, args->requested_serial);
+	trans = rf2500hidapi_open(args->path, args->requested_serial,
+			(args->flags & DEVICE_FLAG_HAS_VID_PID), args->vid, args->pid);
 #else
-	trans = rf2500_open(args->path, args->requested_serial);
+	trans = rf2500_open(args->path, args->requested_serial,
+			(args->flags & DEVICE_FLAG_HAS_VID_PID), args->vid, args->pid);
 #endif
 	if (!trans)
 		return NULL;
@@ -79,8 +81,9 @@ static device_t fet_open_olimex_iso_mk2(const struct device_args *args)
 	if (args->flags & DEVICE_FLAG_TTY)
 		trans = comport_open(args->path, 115200);
 	else
-		trans = cdc_acm_open(args->path, args->requested_serial,
-				     115200, 0x15ba, 0x0100);
+		trans = cdc_acm_open(args->path, args->requested_serial, 115200,
+				(args->flags & DEVICE_FLAG_HAS_VID_PID) ? args->vid : 0x15ba,
+				(args->flags & DEVICE_FLAG_HAS_VID_PID) ? args->pid : 0x0100);
 
 	if (!trans)
 		return NULL;
@@ -100,9 +103,9 @@ static device_t fet_open_olimex_iso_mk2(const struct device_args *args)
 		if (args->flags & DEVICE_FLAG_TTY)
 			trans = comport_open(args->path, 115200);
 		else
-			trans = cdc_acm_open(args->path,
-				    args->requested_serial,
-				    115200, 0x15ba, 0x0100);
+			trans = cdc_acm_open(args->path, args->requested_serial, 115200,
+				(args->flags & DEVICE_FLAG_HAS_VID_PID) ? args->vid : 0x15ba,
+				(args->flags & DEVICE_FLAG_HAS_VID_PID) ? args->pid : 0x0100);
 
 		if (!trans)
 			return NULL;
@@ -141,8 +144,9 @@ static device_t fet_open_olimex(const struct device_args *args)
 	if (args->flags & DEVICE_FLAG_TTY)
 		trans = comport_open(args->path, 115200);
 	else
-		trans = cdc_acm_open(args->path, args->requested_serial,
-				     115200, 0x15ba, 0x0031);
+		trans = cdc_acm_open(args->path, args->requested_serial, 115200,
+				 (args->flags & DEVICE_FLAG_HAS_VID_PID) ? args->vid : 0x15ba,
+				 (args->flags & DEVICE_FLAG_HAS_VID_PID) ? args->pid : 0x0031);
 
 	if (!trans)
 		return NULL;
@@ -177,8 +181,9 @@ static device_t fet_open_olimex_v1(const struct device_args *args)
 	if (args->flags & DEVICE_FLAG_TTY)
 		trans = comport_open(args->path, 500000);
 	else
-		trans = cp210x_open(args->path, args->requested_serial,
-				    500000, 0x15ba, 0x0002);
+		trans = cp210x_open(args->path, args->requested_serial, 500000,
+				(args->flags & DEVICE_FLAG_HAS_VID_PID) ? args->vid : 0x15ba,
+				(args->flags & DEVICE_FLAG_HAS_VID_PID) ? args->pid : 0x0002);
 
         if (!trans)
                 return NULL;
@@ -213,7 +218,9 @@ static device_t fet_open_olimex_iso(const struct device_args *args)
 		trans = comport_open(args->path, 200000);
 	else
 		trans = ftdi_open(args->path, args->requested_serial,
-				  0x15ba, 0x0008, 200000);
+				  (args->flags & DEVICE_FLAG_HAS_VID_PID) ? args->vid : 0x15ba,
+				  (args->flags & DEVICE_FLAG_HAS_VID_PID) ? args->pid : 0x0008,
+				  200000);
 
 	if (!trans)
 		return NULL;
@@ -248,7 +255,8 @@ static device_t fet_open_uif(const struct device_args *args)
 	if (args->flags & DEVICE_FLAG_TTY)
 		trans = comport_open(args->path, 460800);
 	else
-		trans = ti3410_open(args->path, args->requested_serial);
+		trans = ti3410_open(args->path, args->requested_serial,
+			(args->flags & DEVICE_FLAG_HAS_VID_PID), args->vid, args->pid);
 
 	if (!trans)
 		return NULL;
diff --git a/mspdebug.man b/mspdebug.man
index 3e23d60..c75e2bd 100644
--- a/mspdebug.man
+++ b/mspdebug.man
@@ -52,6 +52,10 @@ section \fBDRIVERS\fR below for details.
 .IP "\-U \fIbus\fR:\fIdevice\fR"
 Specify a particular USB device to connect to. Without this option,
 the first device of the appropriate type is opened.
+.IP "\-V \fIvid\fR:\fIpid\fR"
+Specify a VID and PID of the USB device to connect to, or override the
+default VID and PID. Some drives, such as \fBmehfet\fR, require this option,
+while others have a default VID and PID which can be overridden.
 .IP "\-s \fIserial\fR"
 Specify a particular USB device serial number to connect to. Use this
 option to distinguish between multiple devices of the same type.
diff --git a/transport/rf2500.c b/transport/rf2500.c
index f0544ae..54301d6 100644
--- a/transport/rf2500.c
+++ b/transport/rf2500.c
@@ -228,7 +228,8 @@ static const struct transport_class rf2500_transport = {
 	.set_modem	= usbtr_set_modem
 };
 
-transport_t rf2500_open(const char *devpath, const char *requested_serial)
+transport_t rf2500_open(const char *devpath, const char *requested_serial,
+		int has_vid_pid, uint16_t vid, uint16_t pid)
 {
 	struct rf2500_transport *tr = malloc(sizeof(*tr));
 	struct usb_device *dev;
@@ -248,8 +249,9 @@ transport_t rf2500_open(const char *devpath, const char *requested_serial)
 	if (devpath)
 		dev = usbutil_find_by_loc(devpath);
 	else
-		dev = usbutil_find_by_id(USB_FET_VENDOR, USB_FET_PRODUCT,
-					 requested_serial);
+		dev = usbutil_find_by_id(has_vid_pid ? vid : USB_FET_VENDOR,
+								 has_vid_pid ? pid : USB_FET_PRODUCT,
+								 requested_serial);
 
 	if (!dev) {
 		free(tr);
diff --git a/transport/rf2500.h b/transport/rf2500.h
index f523071..e637336 100644
--- a/transport/rf2500.h
+++ b/transport/rf2500.h
@@ -27,7 +27,9 @@
  *
  * A particular device may be specified in bus:dev form.
  */
-transport_t rf2500_open(const char *dev_path, const char *requested_serial);
-transport_t rf2500hidapi_open(const char *dev_path, const char *requested_serial);
+transport_t rf2500_open(const char *dev_path, const char *requested_serial,
+		int has_vid_pid, uint16_t vid, uint16_t pid);
+transport_t rf2500hidapi_open(const char *dev_path, const char *requested_serial,
+		int has_vid_pid, uint16_t vid, uint16_t pid);
 
 #endif
diff --git a/transport/rf2500hidapi.c b/transport/rf2500hidapi.c
index d971f6c..0902ea7 100644
--- a/transport/rf2500hidapi.c
+++ b/transport/rf2500hidapi.c
@@ -161,7 +161,8 @@ static const wchar_t * get_wc(const char *c)
     return wc;
 }
 
-transport_t rf2500hidapi_open(const char *devpath, const char *requested_serial)
+transport_t rf2500hidapi_open(const char *devpath, const char *requested_serial,
+		int has_vid_pid, uint16_t vid, uint16_t pid)
 {
 	struct rf2500_transport *tr = malloc(sizeof(*tr));
 	hid_device *handle;
@@ -186,7 +187,9 @@ transport_t rf2500hidapi_open(const char *devpath, const char *requested_serial)
 		} else {
 			wc_serial = NULL;
 		}
-		handle = hid_open(USB_FET_VENDOR, USB_FET_PRODUCT, wc_serial);
+		handle = hid_open(has_vid_pid ? vid : USB_FET_VENDOR,
+						has_vid_pid ? pid : USB_FET_PRODUCT, wc_serial);
+
 		if ( wc_serial ) {
 			free((wchar_t *)wc_serial);
 		}
diff --git a/transport/ti3410.c b/transport/ti3410.c
index b96fed8..de51388 100644
--- a/transport/ti3410.c
+++ b/transport/ti3410.c
@@ -559,7 +559,8 @@ static const struct transport_class ti3410_transport = {
 	.set_modem	= ti3410_set_modem
 };
 
-transport_t ti3410_open(const char *devpath, const char *requested_serial)
+transport_t ti3410_open(const char *devpath, const char *requested_serial,
+		int has_vid_pid, uint16_t vid, uint16_t pid)
 {
 	struct ti3410_transport *tr = malloc(sizeof(*tr));
 	struct usb_device *dev;
@@ -578,8 +579,9 @@ transport_t ti3410_open(const char *devpath, const char *requested_serial)
 	if (devpath)
 		dev = usbutil_find_by_loc(devpath);
 	else
-		dev = usbutil_find_by_id(USB_FET_VENDOR, USB_FET_PRODUCT,
-					 requested_serial);
+		dev = usbutil_find_by_id(has_vid_pid ? vid : USB_FET_VENDOR,
+								 has_vid_pid ? pid : USB_FET_PRODUCT,
+								 requested_serial);
 
 	if (!dev) {
 		free(tr);
diff --git a/transport/ti3410.h b/transport/ti3410.h
index 8ef879e..f57ef21 100644
--- a/transport/ti3410.h
+++ b/transport/ti3410.h
@@ -24,6 +24,8 @@
 /* This function is for opening an eZ430-F2013 or FET430UIF device via
  * libusb.
  */
-transport_t ti3410_open(const char *dev_path, const char *requested_serial);
+transport_t ti3410_open(const char *dev_path, const char *requested_serial,
+		int has_vid_pid, uint16_t vid, uint16_t pid);
+
 
 #endif
diff --git a/ui/main.c b/ui/main.c
index 7a914ac..01c1738 100644
--- a/ui/main.c
+++ b/ui/main.c
@@ -114,6 +114,9 @@ static void usage(const char *progname)
 "        Connect via the given tty device, rather than USB.\n"
 "    -U bus:dev\n"
 "        Specify a particular USB device to connect to.\n"
+"    -V vid:pid\n"
+"        Specify a particular vid:pid par of a USB to connect to, instead of\n"
+"        a driver-specific default.\n"
 "    -s serial\n"
 "        Specify a particular device serial number to connect to.\n"
 "    -j\n"
@@ -328,7 +331,7 @@ static int parse_cmdline_args(int argc, char **argv,
 	int opt;
 	int want_usb = 0;
 
-	while ((opt = getopt_long(argc, argv, "d:jv:nU:s:qC:",
+	while ((opt = getopt_long(argc, argv, "d:jv:nUV:s:qC:",
 				  longopts, NULL)) >= 0)
 		switch (opt) {
 		case 'C':
@@ -398,6 +401,18 @@ static int parse_cmdline_args(int argc, char **argv,
 			want_usb = 1;
 			break;
 
+		case 'V':
+			/* optarg is in "vid:pid" format, which we now need to parse */
+			if (sscanf(optarg, "%04hx:%04hx", &args->devarg.vid, &args->devarg.pid) == 2) {
+				args->devarg.flags |= DEVICE_FLAG_HAS_VID_PID;
+				want_usb = 1;
+			} else {
+				printc("Invalid -V option specified: %s."
+					   "Format should be '<vid>:<pid>'\n", optarg);
+				exit(1);
+			}
+			break;
+
 		case 's':
 			args->devarg.requested_serial = optarg;
 			break;