FLAC doesnt work in any apple devices

[apollolux]

FLAC can be converted to ALAC with retention of the same quality, yes, assuming you leave the sample rate and bit depth intact.

How to fix that ! I am not expert in these things. I got an open source converter named Max though.

If by "Max" you mean this free, open-source converter software for Mac OS X, then yes it can convert FLAC to Apple Lossless. I personally use the command-line FFmpeg to convert FLAC to ALAC because it's kept relatively up-to-date, but I'm confident Max will still run on 10.7/Lion and later. I don't personally know how to use Max but I'm confident from seeing the screenshots that it is fairly intuitive to use.

FLAC stands for "Free Lossless Audio Codec" and ALAC stands for "Apple Lossless Audio Codec." FLAC was created before Apple open-sourced ALAC, and now that ALAC is open-source any sufficiently modern/updated player should be able to support playing ALAC *.m4a files.

I listen to subs through Apple EarPods using an iPod Touch myself, though all of them have been Shannon's MP3s so far. Android's built-in music player (at least since 4.0/Ice Cream Sandwich) should also be able to play *.m4a (and likely FLAC) natively, otherwise there are plenty of free audio players on the Google Play Store that can play ALAC *.m4a and FLAC.