Searching for the solution of proximity sensor issues, I found somewhere a kind of application named HtcM7ProximFix-v1.0.apk, but it has been prepared for latest version of software JB 4.2.2. I previous was on this software version and because of to many bugs I goes back to 4.1.1 (3.20.401.1). version but now I see the some problem again, the proximity sensor doesn't work. I tried to install mentioned application but it cannot be installed because of old version software already installed. Can somebody help me on this issue, is there any application to fix proximity sensor no software version 4.1.1? Any kind of help shall be much appreciated.