For v1.4 eg. the partitions will be the same size and you can just upgrade what you want.
Also tried to make simple zip updates, but TWRP recovery is not working properly on RK3288 devices, otherwise it would have been very easy.
You can use Titanium backup to easily backup your apps/data and restore to a new ROM.
Will try to include latest su binary in new ROM. The only reason it's necessary is to give root, doesn't matter if it's an old version.
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