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I turned my streaming stick into a dumb app launcher, and that's all it should be
(www.xda-developers.com)
This is a most excellent place for technology news and articles.
Can't speak to cutting edge options but will say when we went to Tokyo at start of year, I took the google Chromecast with TV (1080p version) + USB pass-thru + 128GB flashdrive.
The Chromecast had Nova player installed. I pointed it at the flashdrive and boom - instant media front end for the kids. Had to connect briefly to scrape images etc but after that was all off line.
That - plus smart tube - meant they could decompress after a day out and about.
That version of the Chromecast has been superseded (though can still buy on eBay).