diff --git a/drivers/usb/gadget/f_fastboot.c b/drivers/usb/gadget/f_fastboot.c
index 6fb9ba8..c14bab9 100644
--- a/drivers/usb/gadget/f_fastboot.c
+++ b/drivers/usb/gadget/f_fastboot.c
@@ -921,7 +921,9 @@
 					}
 				} else {
 					FB_DBG("find_mmc_partition_by_name fail\n");
-					sprintf(str_num, "get fail");
+					fastboot_tx_write_str(
+						"FAILpartition does not exist");
+					return;
 				}
 			}
 			strncat(response, str_num, chars_left);