Lenovo — Lenovo mobile service centre

Address:

Kanpur, Uttar Pradesh, 208017

Dear sir,
I have lenovo k4 note mobile hand set purchased 3 month ago...last month company provide update of marshmallow 6.0 and for that i visited lenovo service centre instead of official marshmallow they installed S200_160309_ROW and this version is not running properly..the official upadate which lenovo is providing and u can update by your own is of 1.6 gb data with build number a7010a48_S214_160527_Row.I have visited lenovo service centre 5 time and every time they kept my set for 2 days and done my handset hard reset .I have facing so much of problem with this marshmallow .please help me out of this.
Thanking you

Kalpendra kumar
[protected]
Kanpur