diff --git a/Makefile b/Makefile
index 358c6870..a3446b00 100644
--- a/Makefile
+++ b/Makefile
@@ -3,16 +3,28 @@ MFLAGS += --no-print-dir
 Q := @
 endif
 
+PC_HOSTED =
+ifeq ($(PROBE_HOST), libftdi)
+	PC_HOSTED = true
+endif
+ifeq ($(PROBE_HOST), pc-stlinkv2)
+	PC_HOSTED = true
+endif
+
 all:
+ifndef 	PC_HOSTED
 	$(Q)if [ ! -f libopencm3/Makefile ]; then \
 		echo "Initialising git submodules..." ;\
 		git submodule init ;\
 		git submodule update ;\
 	fi
 	$(Q)$(MAKE) $(MFLAGS) -C libopencm3 lib
+endif
 	$(Q)$(MAKE) $(MFLAGS) -C src
 
 clean:
+ifndef 	PC_HOSTED
 	$(Q)$(MAKE) $(MFLAGS) -C libopencm3 $@
+endif
 	$(Q)$(MAKE) $(MFLAGS) -C src $@
 
diff --git a/src/platforms/pc-stlinkv2/stlinkv2.c b/src/platforms/pc-stlinkv2/stlinkv2.c
index 9d2f9b2c..ab6fa44d 100644
--- a/src/platforms/pc-stlinkv2/stlinkv2.c
+++ b/src/platforms/pc-stlinkv2/stlinkv2.c
@@ -33,6 +33,7 @@
 #include <assert.h>
 #include <unistd.h>
 #include <signal.h>
+#include <ctype.h>
 #include <sys/time.h>
 
 #if !defined(timersub)
@@ -206,7 +207,7 @@ typedef struct {
 	uint16_t     vid;
 	uint16_t     pid;
 	uint8_t      transport_mode;
-	uint8_t      serial[32];
+	char         serial[32];
 	uint8_t      dap_select;
 	uint8_t      ep_tx;
 	uint8_t      ver_hw;     /* 20, 21 or 31 deciphered from USB PID.*/
@@ -719,16 +720,38 @@ void stlink_init(int argc, char **argv)
 			}
 			r = libusb_open(dev, &Stlink.handle);
 			if (r == LIBUSB_SUCCESS) {
+				uint8_t data[32];
+				uint16_t lang;
+				libusb_get_string_descriptor(
+					Stlink.handle, 0, 0, data, sizeof(data));
+				lang = data[2] << 8 | data[3];
+				unsigned char sernum[32];
 				if (desc.iSerialNumber) {
-					r = libusb_get_string_descriptor_ascii
-						(Stlink.handle,desc.iSerialNumber, Stlink.serial,
-						 sizeof(Stlink.serial));
+					r = libusb_get_string_descriptor
+						(Stlink.handle, desc.iSerialNumber, lang,
+						  sernum, sizeof(sernum));
 				} else {
 					DEBUG("No serial number\n");
 				}
-				if (serial && (!strncmp((char*)Stlink.serial, serial, strlen(serial))))
+				/* Older devices have hex values instead of ascii
+				 * in the serial string. Recode eventually!*/
+				bool readable = true;
+				uint16_t *p = (uint16_t *)sernum;
+				for (p += 1; *p; p++) {
+					bool isr = isalnum(*p);
+					readable &= isr;
+				}
+				char *s = Stlink.serial;
+				p = (uint16_t *)sernum;
+				for (p += 1; *p; p++, s++) {
+					if (readable)
+						*s = *p;
+					else
+						snprintf(s, 3, "%02x", *p & 0xff);
+				}
+				if (serial && (!strncmp(Stlink.serial, serial, strlen(serial))))
 					DEBUG("Found ");
-				if (!serial || (!strncmp((char*)Stlink.serial, serial, strlen(serial)))) {
+				if (!serial || (!strncmp(Stlink.serial, serial, strlen(serial)))) {
 					if (desc.idProduct == PRODUCT_ID_STLINKV2) {
 						DEBUG("STLINKV20 serial %s\n", Stlink.serial);
 						Stlink.ver_hw = 20;
@@ -753,7 +776,7 @@ void stlink_init(int argc, char **argv)
 						DEBUG("Unknown STLINK variant, serial %s\n", Stlink.serial);
 					}
 				}
-				if (serial && (!strncmp((char*)Stlink.serial, serial, strlen(serial))))
+				if (serial && (!strncmp(Stlink.serial, serial, strlen(serial))))
 					break;
 			} else {
 				DEBUG("Open failed %s\n", libusb_strerror(r));
diff --git a/upgrade/Makefile b/upgrade/Makefile
index 397b3e6a..17d898ed 100644
--- a/upgrade/Makefile
+++ b/upgrade/Makefile
@@ -1,5 +1,13 @@
 OUTFILE = blackmagic_upgrade
 
+PC_HOSTED =
+ifeq ($(PROBE_HOST), libftdi)
+        PC_HOSTED = true
+endif
+ifeq ($(PROBE_HOST), pc-stlinkv2)
+        PC_HOSTED = true
+endif
+
 CC = $(CROSS_COMPILE)gcc
 
 CFLAGS = -Wall -Wextra -std=gnu99 -O0 -g -MD -mno-ms-bitfields
@@ -10,7 +18,29 @@ OBJ =	bindata.o	\
 	stm32mem.o	\
 	main.o
 
+ifndef $(PROBE_HOST)
+	PROBE_HOST=native
+endif
+
+ifndef  PC_HOSTED
 all: $(OUTFILE)
+else
+all:
+ ifeq ($(PROBE_HOST), libftdi)
+	@echo "Libftdi needs no firmware update"
+ endif
+ ifeq ($(PROBE_HOST), pc-stlinkv2)
+	@echo "Pc-stlinkv2 use ST provided tools for firmware update"
+ endif
+endif
+
+bindata.o: $(PROBE_HOST).d
+
+$(PROBE_HOST).d: ../src/blackmagic.bin
+	-rm *.d
+	make -C ../src $0 clean
+	make -C ../src $0
+	touch $(PROBE_HOST).d
 
 $(OUTFILE) $(OUTFILE).exe: $(OBJ)
 	$(CC) $(CFLAGS) -o $@ $^ $(LDFLAGS)
diff --git a/upgrade/main.c b/upgrade/main.c
index 38fa5752..3e10b9a3 100644
--- a/upgrade/main.c
+++ b/upgrade/main.c
@@ -157,7 +157,7 @@ retry:
 		printf("Progress: %d%%\r", (offset*100)/bindatalen);
 		fflush(stdout);
 		assert(stm32_mem_erase(handle, iface, LOAD_ADDRESS + offset) == 0);
-		stm32_mem_write(handle, iface, (void*)&bindata[offset], 1024);
+		stm32_mem_write(handle, iface, (void*)&bindata[offset], 1024, LOAD_ADDRESS + offset);
 	}
 	stm32_mem_manifest(handle, iface);
 
diff --git a/upgrade/stm32mem.c b/upgrade/stm32mem.c
index 53bbb5b9..2d9d1369 100644
--- a/upgrade/stm32mem.c
+++ b/upgrade/stm32mem.c
@@ -69,8 +69,13 @@ int stm32_mem_erase(usb_dev_handle *dev, uint16_t iface, uint32_t addr)
 	return stm32_download(dev, iface, 0, request, sizeof(request));
 }
 
-int stm32_mem_write(usb_dev_handle *dev, uint16_t iface, void *data, int size)
+int stm32_mem_write(usb_dev_handle *dev, uint16_t iface, void *data, int size, uint32_t addr)
 {
+	uint8_t request[5];
+
+	request[0] = STM32_CMD_SETADDRESSPOINTER;
+	memcpy(request+1, &addr, sizeof(addr));
+	stm32_download(dev, iface, 0, request, sizeof(request));
 	return stm32_download(dev, iface, 2, data, size);
 }
 
diff --git a/upgrade/stm32mem.h b/upgrade/stm32mem.h
index fd99c656..b8a013ac 100644
--- a/upgrade/stm32mem.h
+++ b/upgrade/stm32mem.h
@@ -27,7 +27,7 @@
 #endif
 
 int stm32_mem_erase(usb_dev_handle *dev, uint16_t iface, uint32_t addr);
-int stm32_mem_write(usb_dev_handle *dev, uint16_t iface, void *data, int size);
+int stm32_mem_write(usb_dev_handle *dev, uint16_t iface, void *data, int size, uint32_t addr);
 int stm32_mem_manifest(usb_dev_handle *dev, uint16_t iface);
 
 #endif