Unfortunately, it's not such "Do that" and voilà.
Check that all the partitions can be mounted correctly, in TWRP.
Anyway, you can try other ROMs too, it's not the same for all.
Also, as I said to you, the cam_vpu images can depend on which other images are in your device right now, for this, check the next...
I flashed all the images, either through SP flash tool or mtk-client., take in account that some images are avoided by SP flash tool.
Also, there is an image that is not flashed, but I guess, you specially need, it's size in A11 is around 480 MB (I don't remember the name). Edit: it´s special_preload (not present in all ROMs)
As a base, I flashed too, some ROMs in ozip format, either through TWRP or Orange Fox, I noticed that sometimes, flashing through one instead of through another makes a difference.