Internal Memory Partition solution for MOVIC W2? - Android Q&A, Help & Troubleshooting

I just want to be able to use the 4GB internal memory completely or at least exchange the 786 MB internal memory for my external sd card.
Hi, My phone was stolen and my brother gifted me a MOVIC W2. It's supposed to have a 4 GB Internal memory. And while it has that, It also comes with a 700 MB Internal Partition where the applications are forced to be installed and another partition for the phone data (like pics, videos, etc). This is what Link2Sd and SD Maid Show:
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In the first pic, the one that says "Interna 23% libre" (Internal 23% free) is the partition that I'm talking about. The other two "Tarjeta SD" (Sd Card) and "Externo SD" (External SD Card) are the total internal memory and the external sd card respectively.
The total Internal Memory was divided in three: "Interna" for apps (786 MB), "Sistema" (System) 787 MB and the remaining is the usable memory on the "Tarjeta SD" to save user data (1.78 GB).
In the second pic, from top to bottom, it shows:
1. External SD Card with 3.68 GB in total
2. Internal SD Card partition for data such as pics, videos, etc. (1.78 GB)
3. Internal SD Card partition for apps (786 MB)
So, I've tried to create another partition on my external SD to use as Internal, linking it with Link2SD and it recreates the links but doesn't work. I tried to change the Internal SD Path with WSM Tool app and XInternalSD app, doesn't work either, I also tried the Vold.fstab (but this version doesn't have that) and tried to change the storage directive in build.prop but it doesn't have that line for persist.vold...
The phone is rooted. I can't find another rom for W2 with Android 5 or 6, only roms for W1 and W5 (Don't know if I can use those)
I just want to be able to use the 4GB internal memory completely or at least exchange the 786 MB internal memory for my external sd card. I leave some pics below with additional phone info.
Please, Help me if you can.
:fingers-crossed::laugh::victory: