We have a very sad news for Sony Xperia M owners because Sony Xperia M C1904 / C1905 has reached end of life time and Sony has decided to end software support for that smartphone.
Sony Xperia M C1904 / C1905 has been announced in June 2013 and Sony has released one major firmware update for that smartphone:
XperiaMAndroid.jpg 30.78K
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and the Android 4.3 Jelly Bean firmware is the latest one. Latest available software is: 15.4.A.1.9. Don't worry, Sony Xperia M C1904 / C1905 just like most of Sony Ericsson / Sony phones is still supported in our Sony Ericsson Online Service and all firmware versions for that smartphone are available 
Source: Sony
