Sony Z3+ Dual E6533 Volte Update - Upgrading, Modifying and Unlocking

Hi Everyone,
I own a Sony device z3+ dual but sony is not providing volte update for reliance jio network for this phone. But Z5 dual & z5 premium already got volte update. I talked to sony several times but they said that this is hardware issue but I'm completely aware that Volte is a software concern. I love my phone and features. It is currently running on Android 7.0.
Let me give you other details :
Z3+ Dual Specs vs Z5+ Dual Specs (please refer gsmarena)
Build Number : 32.3.A.2.33
I am also thinking if there could be any way to install Xperia Z5 dual rom or atleast it's volte patch on my xperia z3+ dual.
These two phones are very much identical.
Will someone give me any favour on it?

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