Voice rec' as ringtone (AMR)

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Posted by twerg
I heard that you can use recordings in the AMR format as a ringtone on SE Z600. Iv tried this and does not work. My firmware is R5C001, do i need a later version? Or is this just not possible to do?

Posted by Ayush
I don't think z6 supports amr as ringtones like 230

Posted by N-er-G
But why not?