![Xiaomi Redmi 3S / 3X / 4(X) / [Note 5A / Y1 - Prime]](/img/device/Mi8937_variant5_6.png)
Released Aug 2017, newest ROM build 1 week ago (2 ROMs still current). A phone that still gets updates keeps going long after its manufacturer stops.
Hardware
- SoC
- Qualcomm MSM8940 Snapdragon 435
- CPU
- Cortex-A53 & Cortex-A53
- GPU
- Qualcomm Adreno 505
- Architecture
- arm64
- RAM
- 3 / 4 GB
- Storage
- 32 / 64 GB
- Screen
- 5.5" · 720x1280 · IPS LCD
- Battery
- 3080 mAh
- Network
- 2G GSM · 3G UMTS · 4G LTE
- Released
- Aug 2017
Sensors & features
- 3.5mm jack
- A-GPS
- Accelerometer
- Compass
- Dual SIM
- FM radio
- Fingerprint reader
- BeiDou
- Galileo
- GLONASS
- GPS
- Gyroscope
- IR blaster
- Light sensor
- Pedometer
- Proximity sensor
- USB OTG
- microSD slot
Specs from the LineageOS wiki (CC BY-SA 3.0).
ROMs · 05
The Xiaomi Redmi 3S / 3X / 4(X) / [Note 5A / Y1 - Prime] (codename Mi8937) has 5 tracked custom ROMs on CustomDroid — including /e/OS, LineageOS for microG, LMODroid and 2 more, running up to Android 16. Each listing links to the project's own download and install guide, and was last checked against the projects' catalogues on 5 Nov 2026.
Mi8937 is a combined codename: one build covers several phones that each have a codename of their own. Their pages list the same builds: Xiaomi Redmi 3S / 3X, Xiaomi Redmi 4x, Xiaomi Redmi Note 5A.
Tick “compare” on two or three builds to see them side by side.
- /e/OSUnofficialprivacy-focusedde-GoogledmicroGlast build 27 Oct 2026 · checked 5 Nov 2026
- LineageOS for microGOfficialde-GoogledmicroGlast build 12 Aug 2026 · checked 5 Nov 2026
- LMODroidOfficiallast build 18 Dec 2025 — over 6 months ago · checked 5 Nov 2026
- LineageOSDiscontinued
installs with fastboot
per LineageOS's install guide for this device — follow it, not this summary
checked 5 Nov 2026 - crDroidDiscontinuedheavy customisation
files and SHA-256 as published
- build file · v7.7 · 741.18 MB · 25 Jun 2021crDroidAndroid-11.0-20210626-mi8937-v7.7.zip
What crDroid published when we last checked. Verify the file you download against the hash on the project's own page; if they differ, don't flash it.
last build 25 Jun 2021 · checked 5 Nov 2026 - build file · v7.7 · 741.18 MB · 25 Jun 2021
RSS feed — subscribe to get new Xiaomi Redmi 3S / 3X / 4(X) / [Note 5A / Y1 - Prime] builds in your reader · JSON
Before you flash
Flashing generally means unlocking the bootloader, booting a custom recovery, wiping, then installing the ROM. Exact steps differ per device and ROM, so follow the Install guide for the one you pick, and back up first. Check what can break (banking apps, DRM, carrier features) and how to get back to stock before you start. Why flash a custom ROM · All guides
This is a Qualcomm device, so on Windows you'll want the Google USB Driver (and QDLoader 9008 to unbrick) before your computer will see it in fastboot. Which USB drivers you need.
LineageOS publishes a step-by-step install guide for this device: wiki.lineageos.org/devices/Mi8937
Timeline
- Jul 2026LineageOS, /e/OS first tracked
- Sept 2026LMODroid, LineageOS for microG first tracked
- Oct 2026crDroid first tracked
Dates show when CustomDroid first indexed each ROM for this device, not when support originally launched.
ROM availability and links come from each project. CustomDroid indexes builds, it doesn't mirror them — always download from the official project, verify the file's hash/signature, confirm it matches your exact codename, and back up before flashing.