A XDA user "Johann0109" has managed to capture the Moto G4 Plus September (2017) OTA update, meaning that owners of the Moto G4 Plus codename Athene can install the update right now if they wish to (link to XDA post at the bottom of the page). But before you do, there are a few things to consider-
XDA developer echo92 has stated that this update can only be flashed on Moto G4 Plus with build NPJS25.93-14-8 (Download link available) and Security patch of 1 June 2017. Note that this OTA file is for the Moto G4 Plus, so do not attempt to flash it on other devices.
We recommend you to wait for the official OTA, as Motorola is about to push the update. Motorola earlier confirmed that they will update the Moto G4 Plus to Android Oreo. But due to the recently discovered BlueBorne vulnerability, the company is first rolling out September patch with fixes.
Also Read: Moto G4 Plus gets Android Oreo via LineageOS
The BlueBorne vulnerability was discovered only recently. It’s a Bluetooth vulnerability that leaves Android devices open to a potential takeover by hackers. The vulnerability is also present in Windows, Linux and some iterations of iOS.
Download: OTA (September Patch for G4 Plus)
Download: NPJS25.93-14-8 (Firmware)