Last week Android 5.1 was made official and naturally made available for Google's Nexus devices. It brought many improvements over previous Lollipop builds, including a few new features, like HD voice calls and silent mode.
The Nexus 6 was one of the handsets that benefited most from the new OS version, which brought about performance improvements and fixes to the handset. That version was distributed to users in the form of an OTA, but a quick look at Google's Factory Images page, reveals that there is now another Android 5.1 build for the same device.
According to the change log, this new software does not bring any significant changes, which is also evident from its identical version number. Instead the LMY47E build comes with a new version of the radio drivers, which signifies some tweaks and changes were made in connectivity cellular, Wi-Fi or otherwise.