
As we've come to expect from large releases, the update is being pushed out over-the-air (OTA) in stages. If you own a Galaxy Tab S 10.5 operating on AT&T's network and would like to see if it's ready for your unit, open up Settings, followed by About Device, select Software Update, then hit the Update Now button. Alternatively, you could always wait until you receive a push notification on the device prompting you to download and install the Marshmallow upgrade. However, you'll need to have at least 50% of battery for the alert to be appear.