rom update mi4w help

dear MIUI fans... I desperately need any help as there is none here in my country... I have the following device details: Model: MI 4W Android version 4.4.2 MIUI Version: MIUI-KXDCNBF91.0 Build Number: KVT49L I went to some local mobile shops and who told me that this rom is the latest (since...