MIUI 7 Global beta ROM 6.3.17 has been released now. This ROM is based on Android Marshmallow 6.0 OS. Many users waited for long, because Xiaomi was facing some trouble with a couple of devices, and they have been testing. Better late than never!
Note : If you are the owner of Mi Pad, Redmi Note Prime (4G, Dual SIM), Redmi Note 2, Redmi Note 3G and Redmi 2, you can get the same version of MIUI ROM. Read this, but that ROM doesn’t change the Android Version.
MIUI 7 Global Beta 6.3.17 ROM based on Android 6.0 Marshmallow can be downloaded here for Mi 3, Mi 4, and Mi Note. If you are already using Beta ROM, you can open updater and check for the update, if you are switching from Stable ROM to Beta ROM, read the article how to flash MIUI ROM. MIUI ROM are flashed in the same way on all devices.