Welcome to the Community Forums! This is a great question, and I would be more than happy to address it for you.
The latest software version released for the Galaxy S5 is Android 6.0.1. With Android 8 being the latest version out, I do not believe Android 7 will be released for this device. I do apologize for any inconvenience this has caused.
Let us know if you have any more questions or concerns, I hope you have a nice day!
Jax, AT&T Community Specialist
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Samsung has officially stopped providing support for the Galaxy S5. Marshmallow is the last operating system update for the phone.
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