How to downgrade from marshmallow 6.0.1 to Lollipop 5.1.1 in sony smartwatch3

Hello,

I have a sony smartwatch 3 with below specification -
Android wear 1.5.0.3044569
Android OS 6.0.1

I want to downgrade to android OS 5.1.1.
Is there any way I can do that?
Basically I want to root my sony smartwatch 3. But Couldn't find any suitable way to root the device with OS 6.0.1. thanks

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