diff --git a/Classes/Manager/FLEXManager.m b/Classes/Manager/FLEXManager.m
index e8d66fe818..83a24ab728 100644
--- a/Classes/Manager/FLEXManager.m
+++ b/Classes/Manager/FLEXManager.m
@@ -237,6 +237,9 @@ - (void)registerDefaultSimulatorShortcuts
 
 + (void)load
 {
+    if ([[[UIDevice currentDevice] systemVersion] floatValue] < 8.0) {
+        return;
+    }
     dispatch_async(dispatch_get_main_queue(), ^{
         [[[self class] sharedManager] registerDefaultSimulatorShortcuts];
     });
diff --git a/Classes/Network/PonyDebugger/FLEXNetworkObserver.m b/Classes/Network/PonyDebugger/FLEXNetworkObserver.m
index 8c626e1829..4f11e2b985 100644
--- a/Classes/Network/PonyDebugger/FLEXNetworkObserver.m
+++ b/Classes/Network/PonyDebugger/FLEXNetworkObserver.m
@@ -101,6 +101,9 @@ + (BOOL)isEnabled
 
 + (void)load
 {
+    if ([[[UIDevice currentDevice] systemVersion] floatValue] < 8.0) {
+        return;
+    }
     // We don't want to do the swizzling from +load because not all the classes may be loaded at this point.
     dispatch_async(dispatch_get_main_queue(), ^{
         if ([self isEnabled]) {
diff --git a/Classes/Utility/FLEXKeyboardShortcutManager.m b/Classes/Utility/FLEXKeyboardShortcutManager.m
index b55138e76e..1c6db21da5 100644
--- a/Classes/Utility/FLEXKeyboardShortcutManager.m
+++ b/Classes/Utility/FLEXKeyboardShortcutManager.m
@@ -135,6 +135,9 @@ + (instancetype)sharedManager
 
 + (void)load
 {
+    if ([[[UIDevice currentDevice] systemVersion] floatValue] < 8.0) {
+        return;
+    }
     SEL originalKeyEventSelector = NSSelectorFromString(@"handleKeyUIEvent:");
     SEL swizzledKeyEventSelector = [FLEXUtility swizzledSelectorForSelector:originalKeyEventSelector];
     
diff --git a/FLEX_Bell.podspec b/FLEX_Bell.podspec
index 3755bb2c54..3448756071 100644
--- a/FLEX_Bell.podspec
+++ b/FLEX_Bell.podspec
@@ -1,6 +1,6 @@
 Pod::Spec.new do |spec|
   spec.name             = "FLEX_Bell"
-  spec.version          = "2.3.0"
+  spec.version          = "2.3.0.1"
   spec.summary          = "A set of in-app debugging and exploration tools for iOS"
   spec.description      = <<-DESC
                         - Inspect and modify views in the hierarchy.
diff --git a/README.md b/README.md
index 04d7b93db8..58a5d3dfa2 100644
--- a/README.md
+++ b/README.md
@@ -10,6 +10,9 @@ FLEX (Flipboard Explorer) is a set of in-app debugging and exploration tools for
 
 ![View Hierarchy Exploration](http://engineering.flipboard.com/assets/flex/basic-view-exploration.gif)
 
+## Difference with [Flipboard/FLEX](https://github.com/Flipboard/FLEX)
+
+`pod` add iOS6 support,but can not be used below iOS8.
 
 ## Give Yourself Debugging Superpowers
 - Inspect and modify views in the hierarchy.