Redmi 3/Pro was launched in January 2016, so probably the device will not get official Android Oreo update from Xiaomi anytime soon. However, if you prefer stock UI over Xiaomi’s heavily customized MIUI, deep customization and LineageOS features, then the LineageOS 15 is the best choice.

The present status of LineageOS 15.0 for ido (Redmi 3) is beta, which means the ROM may include several bugs that are not yet identified. It is also buggy and unstable. Do not flash it now on your Redmi 3, if it is your main phone. What is working: Boots, RIL (Calls, SMS, Data), Fingerprint (FPC1020 only), Wi-Fi, Bluetooth, Camera, Video Playback, Audio, Sensors, Flash, LED, GPS, etc. What’s not working: HDR. Prerequisites for installing LOS 15 on Redmi 3 – Bootloader unlocked and latest version of TWRP recovery installed – Backup every important data you have on the phone – Above 80% battery charge remaining on the phone Also Read: Download and install latest MIUI 9 Global Beta ROM on Redmi 3

How to Install LOS (unofficial) on Redmi 3 (ido)

  1. Download unofficial LOS 15 (ido) for Redmi 3/Pro from here (source). Also, download Gapps package from here. Save both zip files on your phone’s storage.
  2. Boot your device into TWRP recovery (Switch off the phone, press and hold Power + Volume Up buttons together).
  3. In TWRP recovery, choose ‘Backup’ option and backup complete system (recommended).
  4. Now, select ‘Wipe’ and then Factory Reset.
  5. Now, select ‘Install’, navigate to LOS 15 zip package. After the installation finished, install Gapps zip file.
  6. Now, return to the main menu and select Reboot, then System. The device will now boot into LineageOS 15. Setup your new OS and enjoy. Any question? Leave it in the comment section below (Source – XDA)