Win JR LTE Updated to Win 10 - anyone else also?

Can somebody tell me how to revert to Win 8.1?i have upgraded two phones BLU win Jr LTE X130e to win 10 and I'm not happy at all. Messenger app doesn't work, bottom part of the screen sometimes doesn't work etc...
Too many bugs. I want win 8.1 again :( please help
 

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