My iPhone was working very slowly, so for removing the problem I have uninstalled its all apps and scanned for the viruses. I had also tried for the recovery mode. Now when I am trying to reinstall those iPhone apps again it is not installing. An error message is just displaying on the screen unsupported file. I had tried with the different setting but still I am not able to fix this problem. So I want to ask from you people, how can I fix this problem?