diff --git a/application.c b/application.c
index d99d274..499ec8b 100644
--- a/application.c
+++ b/application.c
@@ -193,16 +193,34 @@ static void command_version(void* argument)
 {
 	(void)argument; // we won't use the argument
 	printf("firmware date: %04u-%02u-%02u\n", BUILD_YEAR, BUILD_MONTH, BUILD_DAY); // show firmware build date
-	// get device identifier (DEV_ID)
-	// 0x412: low-density, 16-32 kB flash
-	// 0x410: medium-density, 64-128 kB flash
-	// 0x414: high-density, 256-512 kB flash
-	// 0x430: XL-density, 768-1024 kB flash
-	// 0x418: connectivity
 	puts("device family: ");
 	switch (DBGMCU_IDCODE & DBGMCU_IDCODE_DEV_ID_MASK) {
-		case 0: // this is a known issue document in STM32F10xxC/D/E Errata sheet, without workaround
-			puts("unreadable\n");
+		case 0: // DBGMCU_IDCODE is only accessible in debug mode (this is a known issue documented in STM32F10xxC/D/E Errata sheet, without workaround)
+			if ((*(uint32_t*)0x1FFFF000 & 0xFFFE0000) == 0x20000000) { // non-connectivity system memory start detected (MSP address pointing to SRAM
+				switch (DESIG_FLASH_SIZE) {
+				case 16:
+				case 32:
+					puts("low-density\n");
+					break;
+				case 64:
+				case 128:
+					puts("medium-density\n");
+					break;
+				case 256:
+				case 512:
+					puts("high-density\n");
+					break;
+				case 768:
+				case 1024:
+					puts("XL-density\n");
+					break;
+				default:
+					printf("unknown\n");
+					break;
+				}
+			} else { // connectivity system memory start is at 0x1FFFB000
+				puts("connectivity\n");
+			}
 			break;
 		case 0x412:
 			puts("low-density\n");
@@ -220,7 +238,7 @@ static void command_version(void* argument)
 			puts("connectivity\n");
 			break;
 		default:
-			puts("unknown\n");
+			printf("unknown (0x%04x)\n", DBGMCU_IDCODE & DBGMCU_IDCODE_DEV_ID_MASK);
 			break;
 	}
 	// show flash size