Xiaomi Mi 4, one of the hottest Chinese-bred flagships of 2014, got two modifications over the course of its lifecycle - that's an achievement right there. The Mi 4i was more of an attractive mid-ranger rather than a Mi 4 spiritual successor, but the Mi 4c is what we call a flagship in disguise and a true successor of the Mi 4.
Source: http://www.gsmarena.com/xiaomi_mi_4c-review-1328.php
