The Vibe S1 is expected to get the Marshmallow update soon. The K3 Note and A7000 smartphones got the Marshmallow update in India recently. Android 6.0 concentrates on App Permissions, Web Experience, App Links and Power & Charging. It also brings new Doze battery saving feature that uses motion detection to cut off background activity when the phone is in standby, but it will still show up for important events like alarms.
The Android 6.0 Marshmallow update for the Lenovo P1 smartphone is 1.67GB in size. One needs to make sure that the device is charged up and are connected to a stable network as the download and installation takes a lot of time. All your saved Fingerprints will be lost and you need to register your fingerprint again after the upgrade. One can check the device for the Android Marshmallow 6.0 update and start the process automatically. Make sure that you backup all the data on your SD card as the update screen mentions, data from the SD card might be lost after the update and it is best to back up before starting the process.