In application manager you can see many files present in .sis format that cant be either installed or deleted. How to delet them? Follow below guidence: You need X-plore file manager. 1. Open X-plore go to configuration menu by pressing "0" tick show hidden folders and system files boxes. 2. Go to E:\private\10202dce on the phone’s folder.* There, you shouldbe able to find the installer files (.sis). Just remove them. 3. If you are unable to access private folder use (Sec Man)caps off and switch off the capabilities then you can access the private folder.