I received my MK903iv Android stick today and I'm very excited to start using it

It currently has android version 4.2.2 on it and I want to upgrade to a more recent version. I tried updating the firmware to 4.4 using Batch Tool 1.7, but it fails.
It gives the massage: layer 2 1 2 test device start - and then it fails.
I do not want to root it right now, just install a newer stock rom. Can anyone give me any advice for this device?
Regards
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