diff --git a/targets/mdbt50qrx-uf2.json b/targets/mdbt50qrx-uf2.json
index a5cd3d34..f7cf1b4d 100644
--- a/targets/mdbt50qrx-uf2.json
+++ b/targets/mdbt50qrx-uf2.json
@@ -4,7 +4,7 @@
     "serial": "usb",
     "flash-1200-bps-reset": "true",
     "flash-method": "msd",
-    "serial-port": ["acm:239a:801b", "acm:239a:010b", "acm:239a:810c"],
+    "serial-port": ["acm:239a:810b", "acm:239a:010b", "acm:239a:810c"],
     "msd-volume-name": "MDBT50QBOOT",
     "msd-firmware-name": "firmware.uf2",
     "uf2-family-id": "0xADA52840",