No reason the demo shouldn't run in iOS5. Tested on my iPad2.

Author: hborders

CachedWebView.xcodeproj/project.pbxproj

@@ -228,7 +228,7 @@
 				GCC_WARN_ABOUT_RETURN_TYPE = YES;
 				GCC_WARN_UNINITIALIZED_AUTOS = YES;
 				GCC_WARN_UNUSED_VARIABLE = YES;
-				IPHONEOS_DEPLOYMENT_TARGET = 5.1;
+				IPHONEOS_DEPLOYMENT_TARGET = 5.0;
 				SDKROOT = iphoneos;
 				TARGETED_DEVICE_FAMILY = 2;
 			};
@@ -247,7 +247,7 @@
 				GCC_WARN_ABOUT_RETURN_TYPE = YES;
 				GCC_WARN_UNINITIALIZED_AUTOS = YES;
 				GCC_WARN_UNUSED_VARIABLE = YES;
-				IPHONEOS_DEPLOYMENT_TARGET = 5.1;
+				IPHONEOS_DEPLOYMENT_TARGET = 5.0;
 				OTHER_CFLAGS = "-DNS_BLOCK_ASSERTIONS=1";
 				SDKROOT = iphoneos;
 				TARGETED_DEVICE_FAMILY = 2;