The stock
Android 4.3 ROM was developed by
Xiaomi developer @秋叶随风 and is
available to
download and
install on both the
Snapdragon S4 and Snapdragon 600 versions of the
Mi2.
I was all up for installing the
ROM on my personal phone until, however this not being an official update GPS isn’t currently supported, neither are OTA updates the
FM radio and the
ROM can’t show network speed in the status bar, however it does offer support for OPENGL ES 3.0 which should prove for a silky smooth experience.
For those of you who are more adventurous than I am you can
download the stock
Android 4.3 ROM for the
Xiaomi Mi2 and
Mi2S along with GAPPS from the
MIUI forum here.