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Summing all the values in the first image under mmc, you get about 16GB, which corresponds to the 16GB ROM you say the phone should have. If these values are indeed right (you can check this against the values in your scatter file) then you should be able to enlage your data partition with at least 8GB. At this moment it is 1GB and you have 12GB of internal sd-card space, thus the new situation could be 9GB for data and 4GB left for your internal sd/card.
As I said, I can't help you with the calculations at this moment, but it looks possible.
Check the size of your user-data partition and the total size of all partitions in your scatter file to see if diskinfo is right.
And if you want to try, you could use EBRtweak at 4GB (as said, EBRtweak is correct upto 4GB) and see if it works. Unless your phone uses a weird EBR scheme or works with UBIFS file system (which I don't think as this is usually the case with very cheap smartphones, but you can also see this in the scatter file) it should work.
btw. a good check to see if indeed you have 12GB of internal sd/card space is to remove the external micro-sd, connect the phone with usb storage to your pc and try to copy a file with a size like 8GB (or even a bunch of smaller files with a total like that) and see if you can.
As I said, I can't help you with the calculations at this moment, but it looks possible.
Check the size of your user-data partition and the total size of all partitions in your scatter file to see if diskinfo is right.
And if you want to try, you could use EBRtweak at 4GB (as said, EBRtweak is correct upto 4GB) and see if it works. Unless your phone uses a weird EBR scheme or works with UBIFS file system (which I don't think as this is usually the case with very cheap smartphones, but you can also see this in the scatter file) it should work.
btw. a good check to see if indeed you have 12GB of internal sd/card space is to remove the external micro-sd, connect the phone with usb storage to your pc and try to copy a file with a size like 8GB (or even a bunch of smaller files with a total like that) and see if you can.
