diff --git a/libraries/AP_HAL_ChibiOS/hwdef/Pix32v5/hwdef-bl.dat b/libraries/AP_HAL_ChibiOS/hwdef/Pix32v5/hwdef-bl.dat
index 8267cd993f..02acbcd407 100644
--- a/libraries/AP_HAL_ChibiOS/hwdef/Pix32v5/hwdef-bl.dat
+++ b/libraries/AP_HAL_ChibiOS/hwdef/Pix32v5/hwdef-bl.dat
@@ -6,4 +6,4 @@ include ../fmuv5/hwdef-bl.dat
 USB_VENDOR 0x3162 # ONLY FOR USE BY Holybro
 USB_PRODUCT 0x004E
 USB_STRING_MANUFACTURER "Holybro"
-USB_STRING_PRODUCT "pix32v5"
+USB_STRING_PRODUCT "pix32v5-BL"
diff --git a/libraries/AP_HAL_ChibiOS/hwdef/mRoX21-777/hwdef-bl.dat b/libraries/AP_HAL_ChibiOS/hwdef/mRoX21-777/hwdef-bl.dat
index 8b0611cbbe..e215cde9b0 100644
--- a/libraries/AP_HAL_ChibiOS/hwdef/mRoX21-777/hwdef-bl.dat
+++ b/libraries/AP_HAL_ChibiOS/hwdef/mRoX21-777/hwdef-bl.dat
@@ -21,7 +21,7 @@ FLASH_SIZE_KB 2048
 
 # USB setup
 USB_STRING_MANUFACTURER "mRo"
-USB_STRING_PRODUCT "X2.1-777"
+USB_STRING_PRODUCT "X2.1-777-BL"
 USB_STRING_SERIAL  "%SERIAL%"
 
 # order of UARTs (and USB)