iOS 8.3 Prevents Access To Applications

Apple has changed the security settings in iOS 8.3, which now prevent managers and file transfer tools like iFunBox, iTools, iExplorer, iBackupBot PhoneView and access to the directory of the app on iPhone, iPad or iPod touch.

Here is the statement by the developers of iFunBox on Facebbok:

iOS 8.3 has ruined our freedom to control the data in our games / app installed. Apple has blocked access to all sandbox all applications installed on iOS 8.3. Previously only the writing was blocked in the executable directory. Now we have lost all control of applications on our devices. We are doing our research about. Before a solution, iFunBox can not access data from any application if the device is not jailbroken. 

iFunBox was one of the first programs to be updated throughout the weekend with a partial correction. Version 2.95 allows you to access data from all applications enabled with the '"iTunes File Sharing". Access to other application requires instead the jailbreak. 

File transfers between a jailbroken iOS device and a Mac / PC can still be performed, but it is important to remember that it was not released a jailbreak for iOS 8.3 yet, and that soon Apple should close the signatures of iOS 8.2 and this means that you can no longer downgrade.