diff --git a/src/platforms/pc-stlinkv2/README.md b/src/platforms/pc-stlinkv2/README.md
index 2d145ad..ad2f78d 100644
--- a/src/platforms/pc-stlinkv2/README.md
+++ b/src/platforms/pc-stlinkv2/README.md
@@ -5,11 +5,13 @@ functionality that BMP needs. This branch implements blackmagic debug probe
 for the STM Stlink as a proof of concept.
 Use at your own risk, but report or better fix problems.
 
-Run the resulting blackmagic_stlinkv2 executabel to start the gdb server
+Run the resulting blackmagic_stlinkv2 executable to start the gdb server
 
-CrosscCompling for windows with mingw succeeds.
+Crosscompling for windows with mingw succeeds.
 
-Drawback: JTAG does not work for chains with multiple devices.
+Drawback:
+- JTAG does not work for chains with multiple devices.
+- STLinkV3 does only work on STM32 devices.
 
 This branch may get forced push. In case of problems:
 - git reset --hard master
diff --git a/src/platforms/pc-stlinkv2/stlinkv2.c b/src/platforms/pc-stlinkv2/stlinkv2.c
index a3ef581..0e1723b 100644
--- a/src/platforms/pc-stlinkv2/stlinkv2.c
+++ b/src/platforms/pc-stlinkv2/stlinkv2.c
@@ -535,7 +535,7 @@ static int send_recv_retry(uint8_t *txbuf, size_t txsize,
 		gettimeofday(&now, NULL);
 		timersub(&now, &start, &diff);
 		if ((diff.tv_sec >= 1) || (res != STLINK_ERROR_WAIT)) {
-			DEBUG("write_retry failed");
+			DEBUG("write_retry failed. ");
 			return res;
 		}
 	}
@@ -558,7 +558,7 @@ static int read_retry(uint8_t *txbuf, size_t txsize,
 		gettimeofday(&now, NULL);
 		timersub(&now, &start, &diff);
 		if ((diff.tv_sec >= 1) || (res != STLINK_ERROR_WAIT)) {
-			DEBUG("read_retry failed");
+			DEBUG("read_retry failed. ");
 			return res;
 		}
 	}
@@ -1172,7 +1172,14 @@ bool adiv5_ap_setup(int ap)
 	uint8_t data[2];
 	send_recv_retry(cmd, 16, data, 2);
 	DEBUG_STLINK("Open AP %d\n", ap);
-	return (stlink_usb_error_check(data, true))? false: true;
+	int res = stlink_usb_error_check(data, true);
+	if (res) {
+		if (Stlink.ver_hw == 30) {
+			DEBUG("STLINKV3 only connects to STM8/32!\n");
+		}
+		return false;
+	}
+	return true;
 }
 
 void adiv5_ap_cleanup(int ap)