It may be mentioned that the Xiaomi Mi A1 was released in September running stock Android 7.1.2 Nougat operating system, which means it doesn't run on MIUI 9.
The beta registration is open to those in all regions until December 11th at 23:59 (Beijing time). Later, the company will take to its MIUI global forum to let the users know if they are selected or not. Once downloaded, go to the "Recruitment" section on the app's homepage. But, he/she should be active in MIUI forums as well as have knowledge about ROMs.
Retailing for ₹14,999, the phone features robust hardware and uncluttered software thanks to Xiaomi's collaboration with Google over the Android One initiative. Before you enroll for Beta testing, be mindful that Beta builds are unstable and prone to occasional bugs and crashes. It is the company's first Android one phone and has received several updates like the security patches and OTA firmware since its launch.
In terms of camera, it has a dual 12MP+12MP wide-angle/telephoto rear camera with 26mm lens and f/2.2 aperture / 50mm lens and f/2.6 aperture, 2X optical zoom, 1.25µm large pixels and dual-LED (dual tone) flash, and a 5MP front-snapper. With the Snapdragon 625 inside supported by 4GB RAM and the Adreno 506 graphics chip, this phone will take care of your daily tasks and whatever you can throw at it. Of course, you would need to own a Xiaomi Mi A1 unit, and provide the IMEI numbers through the secure application process.