Sony Xperia M owners are now able to enjoy nightly builds of CyanogenMod 12 (Android 5.0.2 Lollipop). The nightly builds are available to single-SIM owners of the Xperia M (C1904, C1905). Head over to the CyanogenMod website and look for code name “nicki” to download the latest CM12 nightly build.
Note: The screenshot below is of a user who installed CM12 on an Xperia M Dual, however only single SIM baseband will work. Xperia M Dual is currently not fully supported.