Edit: this post was meant to be a reply to
pcristi's post here, which seams now being deleted meanwhile...
Edit 2: He's post is back again, but as a new one...
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It looks like, he can return the Box in warranty, chances are good, as everything happened in the "official way", that he can end up getting a working Box again from the seller (but not 100% sure yet).
The method you posted is quite difficult and I guess a bit dangerous as well, so we leave this as a very final resolve.
As I know recovery check if FW is Hi3798CV200 or Hi3798MV200 FW then need to be reject before to get brick because of load DDR4 bootloader(Q100) on Q10Pro(DDR3), but only HiMedia can confirm this.
Q10Pro with Q100 bootloader not sound good at all.
Keep me finger cross to him to get success recovery.
Sorry, but it's barely understandable what you have meant in the quoted sentences. Could you somehow form it a bit more clearer? Maybe has it something related to the himedia.hu site's version of the 2.1.7 FW? (Which is diagnosed by you as a "wrong version", as mentioned in the 2.1.7 FW Thread here, which is still unclear exactly why...)
And thanks for the reply!