Zopo fulfilled their commitment to provide OS upgrade support to its three older version of Android mobile phones listed below.
1. Zopo Color C (ZP330)
2. Zopo Color E (ZP350)
3. Zopo Color S5.5 (ZP370)
Now you can upgrade these mobiles to Android Marshmallow 6.0
Link: http://www.zopomobile.com/download/color/