A security change in iOS 8.3 prevents some file manager and transfer utilities like iFunBox and iExplorer from accessing app directories on an iPhone, iPad or iPod touch, MacRumors notes. The apps allow users to manage, transfer and back up data between their iOS devices and a Mac or PC, but updated iOS 8.3 security features blocked the apps’ ability to control data in installed apps and games.
Scrambling for a fix over the weekend, iFunBox released an updated version that partially addressed the problem, allowing any music file to be imported as a ringtone, and apps with “iTunes File Sharing” enabled to be opened for sandbox browsing. Any other apps are still not accessible in iOS 8.3.
Macroplant’s iExplorer claims to be iOS 8.3 ready, making no mention of the security issues..