diff --git a/firmware/Makefile b/firmware/Makefile
index b9f267bd..e3bb418d 100644
--- a/firmware/Makefile
+++ b/firmware/Makefile
@@ -95,7 +95,7 @@ C_OSMOCORE = $(notdir $(wildcard libosmocore/source/*.c))
 C_LIBCHIP  = $(notdir $(wildcard $(AT91LIB)/libchip_sam3s/source/*.c) $(wildcard $(AT91LIB)/libchip_sam3s/cmsis/*.c))
 
 C_LIBUSB     = USBDescriptors.c USBRequests.c USBD.c USBDCallbacks.c USBDDriver.c USBDDriverCallbacks.c
-C_LIBUSB_RT  = dfu.c dfu_desc.c dfu_runtime.c
+C_LIBUSB_RT  = dfu.c dfu_runtime.c
 C_LIBUSB_DFU = dfu.c dfu_desc.c dfu_driver.c
 C_LIBCOMMON  = string.c stdio.c fputs.c req_ctx.c ringbuffer.c
 
diff --git a/firmware/apps/cardem/usb_strings.txt b/firmware/apps/cardem/usb_strings.txt
index a9c3a8e8..0e797ac2 100644
--- a/firmware/apps/cardem/usb_strings.txt
+++ b/firmware/apps/cardem/usb_strings.txt
@@ -4,5 +4,7 @@ SIMtrace Sniffer
 SIMtrace CCID
 SIMtrace Phone
 SIMtrace MITM
-CardEmulator USIM1
-CardEmulator USIM2
+CardEmulator Modem 1
+CardEmulator Modem 2
+CardEmulator Modem 3
+CardEmulator Modem 4
diff --git a/firmware/libboard/qmod/source/board_qmod.c b/firmware/libboard/qmod/source/board_qmod.c
index 028d582e..2191a62e 100644
--- a/firmware/libboard/qmod/source/board_qmod.c
+++ b/firmware/libboard/qmod/source/board_qmod.c
@@ -19,6 +19,9 @@ static const Pin pin_peer_erase = {PIO_PA11, PIOA, ID_PIOA, PIO_OUTPUT_0, PIO_DE
 static const Pin pin_conn_usim1 = {PIO_PA20, PIOA, ID_PIOA, PIO_OUTPUT_1, PIO_DEFAULT};
 static const Pin pin_conn_usim2 = {PIO_PA28, PIOA, ID_PIOA, PIO_OUTPUT_1, PIO_DEFAULT};
 
+/* array of generated USB Strings */
+extern unsigned char *usb_strings[];
+
 static void qmod_use_physical_sim(unsigned int nr, int physical)
 {
 	const Pin *pin;
@@ -230,6 +233,11 @@ void board_main_top(void)
 		TRACE_INFO("Detected Quad-Modem ST12\n\r");
 	} else {
 		TRACE_INFO("Detected Quad-Modem ST34\n\r");
+		/* make sure we use the second set of USB Strings
+		 * calling the interfaces "Modem 3" and "Modem 4" rather
+		 * than 1+2 */
+		usb_strings[7] = usb_strings[9];
+		usb_strings[8] = usb_strings[10];
 	}
 
 	/* Obtain the circuit board version (currently just prints voltage */