[Q] How to update without OTA or custom ROM

Hi, I’m new in this forum and I’m a very beginner. I have a Tp-link C5 max (702C) [rooted] and I want to upgrade from Android 5.1 to 7.1.2. but there’s no official upgrade (and may be never) or customs ROMs for the device. I think that it is possible but I don’t know how.

After a little research I concluded that I need “port” a ROM or “customize” my own ROM. Is that correct? If it’s, could you help me telling me exactly what to change and how? If not, any idea to do that?

Thanks a lot

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