Database [Q] WhatsApp: How to merge databases

Heya.

I have 2 whatsapp chat backup files in the format msgstore.db.crypt7 / 5.
If I install whatsapp with one of the files in the databases folder, it will ask if I want to import them and does it successfully.
But if I have 2 files in there, it just chooses one.

I can decrypt one of them since its the current one I am using and my phone is rooted, but the other one is old and from before the phone was rooted.
So the first one I can open with SQLite viewer, the second one I can't - so can't merge sqlite files.

I tried using WhatsApp Xtract but it seems its old and doesn't support crypt5/7 formats.

How can I accomplish this?

Thanks!
LG G2 D802

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