Google’s Android M update will be available in developer preview mode starting with Thursday, but not all existing Nexus device owners will be able to install it.-After unveiling the main features of the new operating system, Google revealed that Nexus 5, Nexus 6, Nexus 9 and Nexus Player owners will be able to try out Android M Developer Preview later today. However, older devices such as the two Nexus 7 tablet models or the Nexus 10-will not get Android M today.- DON’T MISS: Here are Android M’s 5 most exciting features A recent report revealed that starting with Android M Google will introduce a clear update guarantee program for Nexus devices so that users know exactly what kind of major

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