malware install on the recovery and can not recovery from factory

I connect the cell in a webpage of xda-developers and dowload an application. that suppose unlock the phone.

If u wan to check the title is sprint Samsung unlocker.

The smartphone download the application at the end, but infectet a wifi booster applications that come with the cell and every time that i do hard reset its the same. can not recovery.

What can i do . already install everything and can not unistalled it.