Can I downgrade my Samsung S5 from Marshmallow (Android 6) to Lollipop (5.1.1) ?

Since my upgrade to Marshmallow, several apps have stopped working or need constant tweaks to work. My battery is draining abnormally fast. I really want to downgrade - this new OS is rubbish!!!! And I thought 5.0 was awful, this is way worse....

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