Can't downgrade to flyme 5.1.12G

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2017-03-23 13:44

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im using flyme 6.7.3.3G beta version now, im facing alot of performance lag in my m2 , mainly the battery drains lol and i can make an omelet using my phone after using a 10-15 mins, i used to downgrade, the update.zip file was fresh when that process complete the display starts to blink continuesly , can't even see the home screen, then i returned to flyme 6.7.3.3G beta, why I can't degrade to flyme 5.1.12G ???
if anyone knows, please give a reply