Yeah.. I should've probably tried to buy a refurbished one online. 
thank you for your help diagnosing the issue.
Just received second refurb EA8300, upgrade worked on first try, now using as wired AP, mesh is next on my list... It's unfortunate you settled for dual band, that leaves one radio for back-haul and one radio for access. Th EA8300 is much more flexible in terms of config possibilities...
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