there's an assert in the updater-script that's why you can't flash it using another recovery but the linked CWM (try to boot it from a different sd card, or load latest stock using amlogic burning tool, had to do that with my brand new device because it wasn't loading any recovery otherwise). Or you can try to modify the updater-script removing that assert.
@assmunche
thank you very much for your kind words

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