Updating OP2 from OxygenOS 2.1.2 to 3.1.0

Hello All,

Can anyone provide the steps for updating my OP2, currently running OxygenOS 2.1. (Android V. 5.1.1) to the latest version.

My device is rooted with TWRP V2.87.0. The device also had Xposed Framework installed.

I need step-by-step process as I do not want to loose any of my DATA.

Thanks in advance.
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Regards,
Nilesh E. Lokhande

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