TeamHorizon's XenonHD unofficial rom builds for Xiaomi Redmi 4/4X (santoni)
[url]http://www.xenonhd.com/[/URL]
XenonHD is a custom firmware aka ROM for various Android devices. It is based on LineageOS 15.1 with additional features, performance and battery life improvements.
The idea behind XenonHD is to give users a ROM that is "blazing fast, rock stable and buttery smooth".

Device Source:
Device Tree
Kernel Source
Vendor Tree
Download Links:
ROM: XenonHD Stable Builds for Santoni
Gapps: opengapps.org
Note: only recommended opengapps official arm64/8.1. Issues are supposed to be solved, but rom was having setup wizard crashes with unofficial gapps packages.[/CENTER]
Flashing Instructions:
To install this ROM you will need to have a latest custom Recovery such as TWRP installed.
If you do not yet have latest TWRP (3.2.xx) for Santoni, do not flash this rom unless you want to be encrypted, decrypted, lose all yor storage and data and who knows what else
If you do not yet have latest TWRP (3.2.xx) for Santoni, do not flash this rom unless you want to be encrypted, decrypted, lose all yor storage and data and who knows what else
- Copy the downloaded ROM to your phone.
- Boot into your recovery
- Back up your ROM
- Make a full wipe (system, data, cache, dalvik)
- Install the ROM
- Install GAPPS package
- Install Magisk if you want root (tested with Magisk v14.0 only)
- Reboot - the first boot can take up to 5 minutes
- Copy the downloaded update to your phone.
- Boot into your recovery
- Back up your ROM
- Install the update
- Optionally wipe caches
- Reboot
Known Bugs
You tell me.
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You tell me.
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Other Links:
Github
Google+
Telegram 
XDA:DevDB Information
Unofficial XenonHD 8.1 ROM by TeamHorizon, ROM for the Xiaomi Redmi 4X
Contributors
Yousef Algadri, abhirajsinghofficial, nik001
Source Code: https://github.com/TeamHorizon
ROM OS Version: 8.x Oreo
ROM Kernel: Linux 3.x
ROM Firmware Required: Unlocked bootloader and Firmware above v30
Based On: LineageOS
Version Information
Status: Stable
Current Stable Version: 1.0
Stable Release Date: 2018-04-22
Created 2018-04-22
Last Updated 2018-04-22