--- a/rules/command.c
+++ b/rules/command.c
@@ -385,13 +385,13 @@ RULES_COMMAND_F(cmd_firmware) {
 
 	infp = fopen(firmware_path, "r");
 	if (infp == NULL) {
-		echo_to_file(sysfs_path_loading, "0\n", 2);
+		echo_to_file(sysfs_path_loading, "-1\n", 2);
 		return -1;
 	}
 	outfp = fopen(sysfs_path_data, "w");
 	if (outfp == NULL) {
 		fclose(infp);
-		echo_to_file(sysfs_path_loading, "0\n", 2);
+		echo_to_file(sysfs_path_loading, "-1\n", 2);
 		return -1;
 	}
 
