UPDATE: it was the faulty cable shipped with the device that was not working!
Meanwhile I messed trying to change the SD card with no luck (same size card, cheap one from AliEx, cloned with dd), the device stuck in 'restoring' boot loop.
I updated the firmware to 4.26.16704 and it works for me.
I now have Plato and KOReader working too.
Thank you all, I will try more mods and post updates here.
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