flex2 should work purchase flex 2 for $3.99 cydia and there are some tweaks on the cloud or make your own I know this thread link or site maybe frowned upon http://www.sinfuliphone.com/showthread.php?t=10040652
Flex 2 works a treat for me on 8.1. No adds and turbo mode is always on. I wish they had some for of donation to remove adds as they do for a lot of apps. Because I'm never going to click the adds and would be happy to pay to remove them. But since they don't I've used flex to remove the adds.
I added this one and it seems to have worked perfectly. It hasn't been opening the App Store which was quite annoying. I shouldn't complain though I guess.
Random question but is it suppose to hook up iPhone to smart tv and play MovieBox through the television?