Update (8/5/19 @ 12:43 PM ET): Xiaomi is rolling out the stable Android Pie update for the global Redmi S2/Redmi Y2.

The Xiaomi Redmi S2 was announced in the first half of 2018 and ran on MIUI 9.1 Android 8.1 Oreo out-of-the-box. The Redmi S2, known as Redmi Y2 in India, was subsequently updated to Oreo-based MIUI 10, fostering hopes about an update to Android Pie. Although the development of Android Pie for the Redmi S2/Y2 hit a snag, Xiaomi does not seem to be eager on giving up on the smartphone this early.

Xiaomi Redmi S2 XDA Forums

We have learned that Redmi S2 has received a stable Android Pie update in China. Since the Redmi S2 is essentially the same as Redmi Y2, we can expect the update to be available in India soon, as well. The Redmi Y2 is one of the best selling smartphones in India, so the offering should be exciting for users.

Download MIUI 10.3.2.0 based on Android Pie for Redmi S2

Xiaomi also remained true to its commitment to release the kernel source code of its smartphones in a timely manner. Along with the update, Xiaomi has also released updated kernel sources based on Android Pie for the Redmi S2/Y2. As required under the GNU GPL, companies are required to share the source code of kernels so that the developer community can benefit from it. The availability of the kernel sources for the smartphone is likely to prompt the development of AOSP-based custom ROMs, custom kernels, and other relevant mods.

Download Android Pie-based kernel source code for Redmi S2

Thanks to XDA Recognized developer yshalsager for the ROM's download link.


Update: Stable Global Release

Xiaomi has begun rolling out the stable Android Pie (MIUI 10.3.3.0) update to the Redmi S2 in China and the Redmi Y2 in India. The full changelog is listed below along with the download link.

Changelog:

App lock

  • New: Locking Google contacts is available now

Contacts

  • Fix: Contacts couldn't be deleted from SIM cards in some cases

Lockscreen, status bar, Notification shade

  • New: Introducing customizable Lock screen clock (Settings > Lock screen & password > Advanced settings).
  • New Lock screen clock doesn't work with third party themes.
  • New: Use your fingerprint to open Home screen once you unlocked the device using face data and stayed on the Lock screen
  • Fix: Media volume couldn't be restored after receiving a notification

Game speed booster

  • Fix: Hands-free call duration wasn't displayed correctly in Game Turbo

Mi Cloud

  • Optimization: Improved sync across multiple devices

Download MIUI 10.3.3.0 based on Android Pie for Redmi S2

Thanks to XDA Recognized developer yshalsager for the ROM's download link.