I can't get CC on my phone any longer?

I've been playibg CC on this phone for well over a year.  I set my phone back to factory settings and now it says my phone is no longer compatible.  I have many boosters (at least 50 gold bars and others)  I'm on level 1312 most of which has taken place on this phone.  I want my boosters back.  I don't get why it won't work on this phone any longer.  How can this be fixed?