MXIII 4k, s802, 2gb - flashing 5.0 or 5.1?

Could someone help me with flashing MXIII s802, 2gb, with custom lollipop rom .. there's a issues with some app installation on kitkat, like smart iptv, so I need lollipop badly. Device is already rooted.

any advice would be appreciate!

thanks!

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