diff --git a/.idea/libraries/Flutter_Plugins.xml b/.idea/libraries/Flutter_Plugins.xml
index c3a4d75..7697da2 100644
--- a/.idea/libraries/Flutter_Plugins.xml
+++ b/.idea/libraries/Flutter_Plugins.xml
@@ -1,9 +1,9 @@
 <component name="libraryTable">
   <library name="Flutter Plugins" type="FlutterPluginsLibraryType">
     <CLASSES>
-      <root url="file://$PROJECT_DIR$/../.pub-cache/hosted/pub.flutter-io.cn/flutter_blue_plus-1.3.1" />
-      <root url="file://$PROJECT_DIR$/../.pub-cache/hosted/pub.flutter-io.cn/permission_handler-10.0.0" />
       <root url="file://$PROJECT_DIR$" />
+      <root url="file://$PROJECT_DIR$/../.pub-cache/hosted/pub.dartlang.org/flutter_blue_plus-1.3.1" />
+      <root url="file://$PROJECT_DIR$/../.pub-cache/hosted/pub.dartlang.org/permission_handler-7.0.0" />
     </CLASSES>
     <JAVADOC />
     <SOURCES />
diff --git a/example/pubspec.lock b/example/pubspec.lock
index e4ca30f..c6247ac 100644
--- a/example/pubspec.lock
+++ b/example/pubspec.lock
@@ -5,70 +5,70 @@ packages:
     dependency: transitive
     description:
       name: async
-      url: "https://pub.flutter-io.cn"
+      url: "https://pub.dartlang.org"
     source: hosted
     version: "2.8.2"
   boolean_selector:
     dependency: transitive
     description:
       name: boolean_selector
-      url: "https://pub.flutter-io.cn"
+      url: "https://pub.dartlang.org"
     source: hosted
     version: "2.1.0"
   characters:
     dependency: transitive
     description:
       name: characters
-      url: "https://pub.flutter-io.cn"
+      url: "https://pub.dartlang.org"
     source: hosted
     version: "1.2.0"
   charcode:
     dependency: transitive
     description:
       name: charcode
-      url: "https://pub.flutter-io.cn"
+      url: "https://pub.dartlang.org"
     source: hosted
     version: "1.3.1"
   clock:
     dependency: transitive
     description:
       name: clock
-      url: "https://pub.flutter-io.cn"
+      url: "https://pub.dartlang.org"
     source: hosted
     version: "1.1.0"
   collection:
     dependency: transitive
     description:
       name: collection
-      url: "https://pub.flutter-io.cn"
+      url: "https://pub.dartlang.org"
     source: hosted
     version: "1.16.0"
   convert:
     dependency: transitive
     description:
       name: convert
-      url: "https://pub.flutter-io.cn"
+      url: "https://pub.dartlang.org"
     source: hosted
     version: "3.0.2"
   cupertino_icons:
     dependency: "direct main"
     description:
       name: cupertino_icons
-      url: "https://pub.flutter-io.cn"
+      url: "https://pub.dartlang.org"
     source: hosted
     version: "1.0.5"
   fake_async:
     dependency: transitive
     description:
       name: fake_async
-      url: "https://pub.flutter-io.cn"
+      url: "https://pub.dartlang.org"
     source: hosted
     version: "1.3.0"
   fixnum:
     dependency: transitive
     description:
       name: fixnum
-      url: "https://pub.flutter-io.cn"
+      url: "https://pub.dartlang.org"
     source: hosted
     version: "1.0.1"
   flutter:
@@ -80,14 +80,14 @@ packages:
     dependency: transitive
     description:
       name: flutter_blue_plus
-      url: "https://pub.flutter-io.cn"
+      url: "https://pub.dartlang.org"
     source: hosted
     version: "1.3.1"
   flutter_lints:
     dependency: "direct dev"
     description:
       name: flutter_lints
-      url: "https://pub.flutter-io.cn"
+      url: "https://pub.dartlang.org"
     source: hosted
     version: "1.0.4"
   flutter_test:
@@ -106,91 +106,70 @@ packages:
     dependency: transitive
     description:
       name: lints
-      url: "https://pub.flutter-io.cn"
+      url: "https://pub.dartlang.org"
     source: hosted
     version: "1.0.1"
   matcher:
     dependency: transitive
     description:
       name: matcher
-      url: "https://pub.flutter-io.cn"
+      url: "https://pub.dartlang.org"
     source: hosted
     version: "0.12.11"
   material_color_utilities:
     dependency: transitive
     description:
       name: material_color_utilities
-      url: "https://pub.flutter-io.cn"
+      url: "https://pub.dartlang.org"
     source: hosted
     version: "0.1.4"
   meta:
     dependency: transitive
     description:
       name: meta
-      url: "https://pub.flutter-io.cn"
+      url: "https://pub.dartlang.org"
     source: hosted
     version: "1.7.0"
   path:
     dependency: transitive
     description:
       name: path
-      url: "https://pub.flutter-io.cn"
+      url: "https://pub.dartlang.org"
     source: hosted
     version: "1.8.1"
   permission_handler:
     dependency: "direct main"
     description:
       name: permission_handler
-      url: "https://pub.flutter-io.cn"
+      url: "https://pub.dartlang.org"
     source: hosted
-    version: "10.0.0"
-  permission_handler_android:
-    dependency: transitive
-    description:
-      name: permission_handler_android
-      url: "https://pub.flutter-io.cn"
-    source: hosted
-    version: "10.0.0"
-  permission_handler_apple:
-    dependency: transitive
-    description:
-      name: permission_handler_apple
-      url: "https://pub.flutter-io.cn"
-    source: hosted
-    version: "9.0.4"
+    version: "7.0.0"
   permission_handler_platform_interface:
     dependency: transitive
     description:
       name: permission_handler_platform_interface
-      url: "https://pub.flutter-io.cn"
+      url: "https://pub.dartlang.org"
     source: hosted
     version: "3.7.0"
-  permission_handler_windows:
-    dependency: transitive
-    description:
-      name: permission_handler_windows
-      url: "https://pub.flutter-io.cn"
-    source: hosted
-    version: "0.1.0"
   plugin_platform_interface:
     dependency: transitive
     description:
       name: plugin_platform_interface
-      url: "https://pub.flutter-io.cn"
+      url: "https://pub.dartlang.org"
     source: hosted
     version: "2.1.2"
   protobuf:
     dependency: transitive
     description:
       name: protobuf
-      url: "https://pub.flutter-io.cn"
+      url: "https://pub.dartlang.org"
     source: hosted
     version: "2.1.0"
   rxdart:
     dependency: transitive
     description:
       name: rxdart
-      url: "https://pub.flutter-io.cn"
+      url: "https://pub.dartlang.org"
     source: hosted
     version: "0.27.5"
   sky_engine:
@@ -202,58 +181,58 @@ packages:
     dependency: transitive
     description:
       name: source_span
-      url: "https://pub.flutter-io.cn"
+      url: "https://pub.dartlang.org"
     source: hosted
     version: "1.8.2"
   stack_trace:
     dependency: transitive
     description:
       name: stack_trace
-      url: "https://pub.flutter-io.cn"
+      url: "https://pub.dartlang.org"
     source: hosted
     version: "1.10.0"
   stream_channel:
     dependency: transitive
     description:
       name: stream_channel
-      url: "https://pub.flutter-io.cn"
+      url: "https://pub.dartlang.org"
     source: hosted
     version: "2.1.0"
   string_scanner:
     dependency: transitive
     description:
       name: string_scanner
-      url: "https://pub.flutter-io.cn"
+      url: "https://pub.dartlang.org"
     source: hosted
     version: "1.1.0"
   term_glyph:
     dependency: transitive
     description:
       name: term_glyph
-      url: "https://pub.flutter-io.cn"
+      url: "https://pub.dartlang.org"
     source: hosted
     version: "1.2.0"
   test_api:
     dependency: transitive
     description:
       name: test_api
-      url: "https://pub.flutter-io.cn"
+      url: "https://pub.dartlang.org"
     source: hosted
     version: "0.4.9"
   typed_data:
     dependency: transitive
     description:
       name: typed_data
-      url: "https://pub.flutter-io.cn"
+      url: "https://pub.dartlang.org"
     source: hosted
     version: "1.3.1"
   vector_math:
     dependency: transitive
     description:
       name: vector_math
-      url: "https://pub.flutter-io.cn"
+      url: "https://pub.dartlang.org"
     source: hosted
     version: "2.1.2"
 sdks:
   dart: ">=2.17.0-0 <3.0.0"
-  flutter: ">=2.8.0"
+  flutter: ">=2.5.0"
diff --git a/example/pubspec.yaml b/example/pubspec.yaml
index d0b091f..5992583 100644
--- a/example/pubspec.yaml
+++ b/example/pubspec.yaml
@@ -17,7 +17,7 @@ environment:
 dependencies:
   flutter:
     sdk: flutter
-  permission_handler: 10.0.0
+  permission_handler: 7.0.0
   hy_printer:
     # When depending on this package from a real application you should use:
     #   hy_printer: ^x.y.z
diff --git a/pubspec.lock b/pubspec.lock
index d295394..c340cab 100644
--- a/pubspec.lock
+++ b/pubspec.lock
@@ -5,63 +5,63 @@ packages:
     dependency: transitive
     description:
       name: async
-      url: "https://pub.flutter-io.cn"
+      url: "https://pub.dartlang.org"
     source: hosted
     version: "2.8.2"
   boolean_selector:
     dependency: transitive
     description:
       name: boolean_selector
-      url: "https://pub.flutter-io.cn"
+      url: "https://pub.dartlang.org"
     source: hosted
     version: "2.1.0"
   characters:
     dependency: transitive
     description:
       name: characters
-      url: "https://pub.flutter-io.cn"
+      url: "https://pub.dartlang.org"
     source: hosted
     version: "1.2.0"
   charcode:
     dependency: transitive
     description:
       name: charcode
-      url: "https://pub.flutter-io.cn"
+      url: "https://pub.dartlang.org"
     source: hosted
     version: "1.3.1"
   clock:
     dependency: transitive
     description:
       name: clock
-      url: "https://pub.flutter-io.cn"
+      url: "https://pub.dartlang.org"
     source: hosted
     version: "1.1.0"
   collection:
     dependency: transitive
     description:
       name: collection
-      url: "https://pub.flutter-io.cn"
+      url: "https://pub.dartlang.org"
     source: hosted
     version: "1.16.0"
   convert:
     dependency: transitive
     description:
       name: convert
-      url: "https://pub.flutter-io.cn"
+      url: "https://pub.dartlang.org"
     source: hosted
     version: "3.0.2"
   fake_async:
     dependency: transitive
     description:
       name: fake_async
-      url: "https://pub.flutter-io.cn"
+      url: "https://pub.dartlang.org"
     source: hosted
     version: "1.3.0"
   fixnum:
     dependency: transitive
     description:
       name: fixnum
-      url: "https://pub.flutter-io.cn"
+      url: "https://pub.dartlang.org"
     source: hosted
     version: "1.0.1"
   flutter:
@@ -73,14 +73,14 @@ packages:
     dependency: "direct main"
     description:
       name: flutter_blue_plus
-      url: "https://pub.flutter-io.cn"
+      url: "https://pub.dartlang.org"
     source: hosted
     version: "1.3.1"
   flutter_lints:
     dependency: "direct dev"
     description:
       name: flutter_lints
-      url: "https://pub.flutter-io.cn"
+      url: "https://pub.dartlang.org"
     source: hosted
     version: "1.0.4"
   flutter_test:
@@ -92,91 +92,70 @@ packages:
     dependency: transitive
     description:
       name: lints
-      url: "https://pub.flutter-io.cn"
+      url: "https://pub.dartlang.org"
     source: hosted
     version: "1.0.1"
   matcher:
     dependency: transitive
     description:
       name: matcher
-      url: "https://pub.flutter-io.cn"
+      url: "https://pub.dartlang.org"
     source: hosted
     version: "0.12.11"
   material_color_utilities:
     dependency: transitive
     description:
       name: material_color_utilities
-      url: "https://pub.flutter-io.cn"
+      url: "https://pub.dartlang.org"
     source: hosted
     version: "0.1.4"
   meta:
     dependency: transitive
     description:
       name: meta
-      url: "https://pub.flutter-io.cn"
+      url: "https://pub.dartlang.org"
     source: hosted
     version: "1.7.0"
   path:
     dependency: transitive
     description:
       name: path
-      url: "https://pub.flutter-io.cn"
+      url: "https://pub.dartlang.org"
     source: hosted
     version: "1.8.1"
   permission_handler:
     dependency: "direct main"
     description:
       name: permission_handler
-      url: "https://pub.flutter-io.cn"
+      url: "https://pub.dartlang.org"
     source: hosted
-    version: "10.0.0"
-  permission_handler_android:
-    dependency: transitive
-    description:
-      name: permission_handler_android
-      url: "https://pub.flutter-io.cn"
-    source: hosted
-    version: "10.0.0"
-  permission_handler_apple:
-    dependency: transitive
-    description:
-      name: permission_handler_apple
-      url: "https://pub.flutter-io.cn"
-    source: hosted
-    version: "9.0.4"
+    version: "7.0.0"
   permission_handler_platform_interface:
     dependency: transitive
     description:
       name: permission_handler_platform_interface
-      url: "https://pub.flutter-io.cn"
+      url: "https://pub.dartlang.org"
     source: hosted
     version: "3.7.0"
-  permission_handler_windows:
-    dependency: transitive
-    description:
-      name: permission_handler_windows
-      url: "https://pub.flutter-io.cn"
-    source: hosted
-    version: "0.1.0"
   plugin_platform_interface:
     dependency: transitive
     description:
       name: plugin_platform_interface
-      url: "https://pub.flutter-io.cn"
+      url: "https://pub.dartlang.org"
     source: hosted
     version: "2.1.2"
   protobuf:
     dependency: transitive
     description:
       name: protobuf
-      url: "https://pub.flutter-io.cn"
+      url: "https://pub.dartlang.org"
     source: hosted
     version: "2.1.0"
   rxdart:
     dependency: transitive
     description:
       name: rxdart
-      url: "https://pub.flutter-io.cn"
+      url: "https://pub.dartlang.org"
     source: hosted
     version: "0.27.5"
   sky_engine:
@@ -188,58 +167,58 @@ packages:
     dependency: transitive
     description:
       name: source_span
-      url: "https://pub.flutter-io.cn"
+      url: "https://pub.dartlang.org"
     source: hosted
     version: "1.8.2"
   stack_trace:
     dependency: transitive
     description:
       name: stack_trace
-      url: "https://pub.flutter-io.cn"
+      url: "https://pub.dartlang.org"
     source: hosted
     version: "1.10.0"
   stream_channel:
     dependency: transitive
     description:
       name: stream_channel
-      url: "https://pub.flutter-io.cn"
+      url: "https://pub.dartlang.org"
     source: hosted
     version: "2.1.0"
   string_scanner:
     dependency: transitive
     description:
       name: string_scanner
-      url: "https://pub.flutter-io.cn"
+      url: "https://pub.dartlang.org"
     source: hosted
     version: "1.1.0"
   term_glyph:
     dependency: transitive
     description:
       name: term_glyph
-      url: "https://pub.flutter-io.cn"
+      url: "https://pub.dartlang.org"
     source: hosted
     version: "1.2.0"
   test_api:
     dependency: transitive
     description:
       name: test_api
-      url: "https://pub.flutter-io.cn"
+      url: "https://pub.dartlang.org"
     source: hosted
     version: "0.4.9"
   typed_data:
     dependency: transitive
     description:
       name: typed_data
-      url: "https://pub.flutter-io.cn"
+      url: "https://pub.dartlang.org"
     source: hosted
     version: "1.3.1"
   vector_math:
     dependency: transitive
     description:
       name: vector_math
-      url: "https://pub.flutter-io.cn"
+      url: "https://pub.dartlang.org"
     source: hosted
     version: "2.1.2"
 sdks:
   dart: ">=2.17.0-0 <3.0.0"
-  flutter: ">=2.8.0"
+  flutter: ">=2.5.0"
diff --git a/pubspec.yaml b/pubspec.yaml
index c094594..f94f5b6 100644
--- a/pubspec.yaml
+++ b/pubspec.yaml
@@ -11,7 +11,7 @@ dependencies:
   flutter:
     sdk: flutter
   flutter_blue_plus: ^1.3.1
-  permission_handler: 10.0.0
+  permission_handler: 7.0.0
 dev_dependencies:
   flutter_test:
     sdk: flutter