7.3.6.0 Changelog from MIUI forums:

System
Optimization-Wi-Fi productivity when Wi-Fi and Bluetooth are used at the same time(06-21)
Fix-Problems with recognition of earphones(06-21)
Fix-Taiwan's far eastone 3 g / 4 g can't identify problems(06-21)

Camera
Optimization-Camera image processing(06-21)

Gonna update tonight when reach home