Previously Motorola released Soak test of Android marshmallow 6.0 for Moto X Play ,Moto G 3rd gen and Moto g 2nd gen as according to the official device list of Motorola Moto E 1st gen and moto e 2nd gen will not get android marshmallow Update.
So we can say that this update will be the last update of Moto 2nd gen 4g model.
#How to get OTA Update in Moto E 2nd gen (4G)
1.Navigate to settings -> about->Check for Update
2.You will see a notification showing a new System software update system version 23.51.65.en.03 is available like below image.
3.Then tap on Yes,I’M IN and select Wi-fi or Mobile Network and tap on DONE ! Your Update will start downloading.
4.After downloading the update it will automatically reboot your device and install the system update.