Onda obook 20 SE. How can I remove bloatware?

I bought this baytrail tablet. It quickly became a nightmare. It's impossible to root. The onda Rom is full of bloatware that keeps install anything from everywere (mostly viruses). I'm a (not so) expert user, i found a rom, downloaded it, unpacked the system.img and mounted it to remove all unnecessary apps, but when i flash it, the tablet doesn't boot. It seems that there's some kind of script that checks the /system partition at boot time. Imagine that when i tried to substitute the su binary, the tablet stopped booting, and when i restored it, well the tabled still doesn't boot... Has anyone found this kind of behaviour in some other china tablet? I can install ubuntu or mint on it but i didn't found any working touch and wifi drivers.

Truly a nightmare. Thank to everyone tha can address me to the right solution!

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