Kobo nia's have 2 known lineup versions till now, where the diffrence is the PMIC, power management system so it manages the battery...
So you have the wrong image propably. You can install inkbox on it, we support both nia's.
If you don't like inkbox, you could donate some money to any open source organisation or developer ( for example inkbox os or me, nicolas ;p ) then I would take and share the image for the diffrent nia as I have access for both, I just don't care about this proprietary os. Just check what Inkbox image works for you first.
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