Problems during upgrading MX5 Flyme OS 5.1.2.0G

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2016-01-26 13:30

Guys, please help me!!!!
I manually upgrade my MX5 to Flyme OS5.1.2.0G_20160106 and the phone does not start!!!! the phone stayed in a infinite loop at start-up where it says "optimizing app x/78" when it finishes says "system upgrading....starting apps" and then goes again....after a minute or 2 it goes back to "optimizing app x/78"
Please help me, I don't know how to fixed. Is it possible to go back to the previous OS? My previous OS was Flyme OS 4.5.4.1I.