Xiaomi is finally brings MIUI9 for all the devices. Vice President of Xiaomi have tweeted regarding this.
What is MIUI9 Global Stable ROM?
MIUI in India, known as MIUI Global comes with 2 different ROM versions: Developer and Stable.
Developer version (Global) is updated every week. It gets new features and bug fixes in every update and is stable enough for daily usage.
Stable version doesn’t have a regular update frequency. It’s updated once a month/two months/even longer to ensure system stability. Common users who prefer ROM stability are recommended to use this version.
As promised, #MIUI9 is now available for all devices!@XiaomiIndia is committed to bringing the best and the latest OS to all our Mi Fans. That's why we're even updating the phones that were launched almost 4 years ago – Mi 3 and Redmi 1S.
— Manu Kumar Jain (@manukumarjain) March 12, 2018
MIUI9 update will be pushed to the users through OTA successively in different batches. For other devices, stay tuned to Mi Community, India they will update you with the same as per the update schedule.
Full Changelog & Download Links for all the devices is here: