change to ignore non-utf-8

src/firmware/xbuilder.rs

@@ -37,8 +37,7 @@ impl Peekable for LastBuildFirmware {
                     .unwrap()
                     .file_name()
                     .unwrap()
-                    .to_str()
+                    .to_string_lossy()
-                    .unwrap()
                     .to_string(),
             );
         }