New MM beta build for the ze551ml

Right now i've got notification on a new beta build:

ZE551ML(WW):V4.21.40.78_20160624_7972


#　 Release Note
1 Updat APN version
2 Improve the stability of incoming call
3 Improve system stability when SIM inserted for Singtel WIFI
4 Add Apps: Facebook, Facebook massager, Instagram

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