FBI Ransomware

Hello, I would really like some help with my problem. I have accidentally infected my Samsung Galaxy Note 2 with the FBI Ransomware virus. It came in the form of a fake Adobe Flash Player download. Me being the idiot that I am tapped on it and wham, my phones locked. I have downloaded Avast on it remotely and activated Safe Mode in order to access my files but Avast won’t run in Safe Mode…Please help because I have ran out of options. I have searched all over the internet and I just cant seem to find a way to fix it.

avast mobile security forum section is here https://forum.avast.com/index.php?board=37.0

Thank you for the assistance. Do you personally have any recommendations?

sorry know little about Android malware…

google give some hits

https://www.google.no/webhp?sourceid=chrome-instant&rlz=1C1SKPC_enNO524NO526&ion=1&espv=2&ie=UTF-8#q=android+ransomware&spell=1