Downgrade from 6.7.3.14 beta to 5.1.12.0G in M3 note M681Q

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2017-03-20 20:33

My m3 note model is M91 and specifically M681Q (asian version). I bought it from internet (everbuying.net) with the unknown firmware 5.3.9.3G installed, with no possibility to update.
After many failed attempts, i manage to install the firmware 6.7.3.14 beta.  It is possible and how,  to install the official global stable firmware 5.1.12.0G  if i want to downgrade?