diff --git a/Makefile b/Makefile
index 7d04772..c2bfb4a 100644
--- a/Makefile
+++ b/Makefile
@@ -65,8 +65,13 @@ endif
 # Build global options
 ##############################################################################
 
+# format va.b-n-gxxxxxxx
+# or     va.b-nn-gxxxxxxx
+# or     va.b-nnn-gxxxxxxx
+# or     ...
+
 ifeq ($(VERSION),)
-  VERSION="$(PROJECT)_$(shell git describe --tags)"
+  VERSION="$(PROJECT)_$(shell git describe --tags --long)"
 endif
 
 ##############################################################################
@@ -297,15 +302,19 @@ clean:
 	rm -f -rf build/tinySA4.* build/lst/*.* build/obj/*.*
 else
 clean:
-	rm -f -rf build/tinySA.*
+	rm -f -rf build/$(PROJECT).*
 endif
 
-flash: build/ch.bin
-	dfu-util -d 0483:df11 -a 0 -s 0x08000000:leave -D build/ch.bin
+flash: build/$(PROJECT).bin
+	-@printf "reset dfu\r" >/dev/cu.usbmodem401 # mac
+	-@printf "reset dfu\r" >/dev/ttyACM0 # linux
+	sleep 2
+	dfu-util -d 0483:df11 -a 0 -s 0x08000000:leave -D $<
+
+dfu:	build/$(PROJECT).hex
+	-@#c:/work/dfu/HEX2DFU $< build/$(PROJECT).dfu # win
+	-@hex2dfu -i $< -o build/$(PROJECT).dfu # mac / linux
 
-dfu:
-	c:/work/dfu/HEX2DFU build/ch.hex build/ch.dfu
-	-@printf "reset dfu\r" >/dev/cu.usbmodem401
 
 TAGS: Makefile
 ifeq ($(TARGET),F303)
diff --git a/ui_sa.c b/ui_sa.c
index 245cfe1..1021ac8 100644
--- a/ui_sa.c
+++ b/ui_sa.c
@@ -4386,13 +4386,23 @@ redraw_cal_status:
 
   // Version
   y += YSTEP + YSTEP/2 ;
-#ifdef TINYSA4
-  strncpy(buf,&TINYSA_VERSION[9], BLEN+1);
-#else
-  strncpy(buf,&TINYSA_VERSION[8], BLEN+1);
-#endif
-  if (buf[7]=='-') {
-    buf[3] = buf[4];
+#ifdef TINYSA4 // 'tinySA4_v1.2-[0-9]*-gxxxxxxx'
+  strncpy(buf,&TINYSA_VERSION[9], BLEN+1); // '1.2-...'
+#else // 'tinySA_v1.2-[0-9]*-gxxxxxxx'
+  strncpy(buf,&TINYSA_VERSION[8], BLEN+1); // '1.2-...'
+#endif
+  if (buf[5]=='-' ) { // '1.2-n-g...'
+    if (buf[4]=='0')  // '1.2-0-g...'
+      buf[3] = 0;  // -> '1.2'
+    else {
+      buf[5] = buf[4]; // -> '1.200n'
+      buf[4] = '0';
+      buf[3] = '0';
+    }
+  } else if (buf[6]=='-' ) { // 1.2-nn-g...
+    buf[3] = '0'; // -> '1.20nn'
+  } else { // 1.2-345-g... (or 1.2-3456...)
+    buf[3] = buf[4]; // -> '1.2345'
     buf[4] = buf[5];
     buf[5] = buf[6];
   }
diff --git a/usbcfg.c b/usbcfg.c
index 7341b06..a57ed3f 100644
--- a/usbcfg.c
+++ b/usbcfg.c
@@ -150,32 +150,82 @@ static const uint8_t vcom_string0[] = {
  * Vendor string.
  */
 static const uint8_t vcom_string1[] = {
-  USB_DESC_BYTE(38),                    /* bLength.                         */
+  USB_DESC_BYTE(22),                    /* bLength.                         */
   USB_DESC_BYTE(USB_DESCRIPTOR_STRING), /* bDescriptorType.                 */
-  'S', 0, 'T', 0, 'M', 0, 'i', 0, 'c', 0, 'r', 0, 'o', 0, 'e', 0,
-  'l', 0, 'e', 0, 'c', 0, 't', 0, 'r', 0, 'o', 0, 'n', 0, 'i', 0,
-  'c', 0, 's', 0
+  't', 0, 'i', 0, 'n', 0, 'y', 0, 's', 0, 'a', 0, '.', 0, 'o', 0, 'r', 0, 'g', 0
 };
 
+#ifdef TINYSA4
 /*
- * Device Description string, use the real name of the device.
+ * Device Description string, use "tinySA4" as in "VERSION"
+ */
+static const uint8_t vcom_string2[] = {
+  USB_DESC_BYTE(16),                    /* bLength.                         */
+  USB_DESC_BYTE(USB_DESCRIPTOR_STRING), /* bDescriptorType.                 */
+  't', 0, 'i', 0, 'n', 0, 'y', 0, 'S', 0, 'A', 0, '4', 0
+};
+#else
+/*
+ * Device Description string, use "tinySA"
  */
 static const uint8_t vcom_string2[] = {
   USB_DESC_BYTE(14),                    /* bLength.                         */
   USB_DESC_BYTE(USB_DESCRIPTOR_STRING), /* bDescriptorType.                 */
   't', 0, 'i', 0, 'n', 0, 'y', 0, 'S', 0, 'A', 0
 };
+#endif
 
+#ifdef TINYSA4
+/*
+ * Serial Number string. VERSION = 'tinySA4_v1.3-nnn-gxxxxxxx'
+ *                                  01234567890123456789012
+ * skip last two 'xx' char due to  'tinySA4_v1.3-n-gxxxxxxx'
+ */
+static const uint8_t vcom_string3[] = {
+  USB_DESC_BYTE(32),                    /* bLength.                         */
+  USB_DESC_BYTE(USB_DESCRIPTOR_STRING), /* bDescriptorType.                 */
+  VERSION[8], 0,  /* 'v' */
+  VERSION[9], 0,  /* '1' */
+  VERSION[10], 0, /* '.' */
+  VERSION[11], 0, /* '3' */
+  VERSION[12], 0, /* '-' */
+  VERSION[13], 0, /* 'n' */
+  VERSION[14], 0, /* 'n' */
+  VERSION[15], 0, /* 'n' */
+  VERSION[16], 0, /* '-' */
+  VERSION[17], 0, /* 'g' */
+  VERSION[18], 0, /* 'x' */
+  VERSION[19], 0, /* 'x' */
+  VERSION[20], 0, /* 'x' */
+  VERSION[21], 0, /* 'x' */
+  VERSION[22], 0, /* 'x' */
+};
+#else
 /*
- * Serial Number string. TODO: use real product version.
+ * Serial Number string. VERSION = 'tinySA_v1.3-nnn-gxxxxxxx'
+ *                                  0123456789012345678901
+ * skip last two 'xx' char due to  'tinySA_v1.3-n-gxxxxxxx'
  */
 static const uint8_t vcom_string3[] = {
-  USB_DESC_BYTE(8),                     /* bLength.                         */
+  USB_DESC_BYTE(32),                    /* bLength.                         */
   USB_DESC_BYTE(USB_DESCRIPTOR_STRING), /* bDescriptorType.                 */
-  '0' + CH_KERNEL_MAJOR, 0,
-  '0' + CH_KERNEL_MINOR, 0,
-  '0' + CH_KERNEL_PATCH, 0
+  VERSION[7], 0,  /* 'v' */
+  VERSION[8], 0,  /* '1' */
+  VERSION[9], 0,  /* '.' */
+  VERSION[10], 0, /* '3' */
+  VERSION[11], 0, /* '-' */
+  VERSION[12], 0, /* 'n' */
+  VERSION[13], 0, /* 'n' */
+  VERSION[14], 0, /* 'n' */
+  VERSION[15], 0, /* '-' */
+  VERSION[16], 0, /* 'g' */
+  VERSION[17], 0, /* 'x' */
+  VERSION[18], 0, /* 'x' */
+  VERSION[19], 0, /* 'x' */
+  VERSION[20], 0, /* 'x' */
+  VERSION[21], 0, /* 'x' */
 };
+#endif
 
 /*
  * Strings wrappers array.