[Xiaomi Mi CC9 / Mi 9 Lite ROMs, Kernels, Recoverie] KamiNS:
/*
* Your warranty is now void.
*
* I am not responsible for bricked devices, dead SD cards,
* thermonuclear war, or you getting fired because the alarm app failed. Please
* do some research if you have any concerns about features included in this ROM
* before flashing it! YOU are choosing to make these modifications, and if
* you point the finger at me for messing up your device, I will laugh at you.
*/

AncientOS is Custom ROM based on AOSP that aims to provide a unique UI with some useful feautures for customization.

Here are the features which AncientOS provides.

[LIST]
[U][B]Ancient Stuff:[/B][/U]
[•]Refined UI with several OneUI touches and an old vibe with intricate patterns in the Settings App.
[•]Lots of status Bar mods.
[•]Lots of new Status bar icons.
[•]Lots of Headers Styles.
[•]Lots of new Headers Clocks and Date Styles.

[U][B]STATUSBAR:[/B][/U]
[•]Statusbar icons.
[•]Traffic indicators.
[•]4G Icon Instead of LTE.
[•]VoLTE icon toggle.
[•]Clock Customization.
[•]Battery Customization.
[•]Battery Bar.
[•]Old mobile type indication.
[•]Statusbar padding preferences.
[•]Battery percentage while changing.

[U][B]Navigation Bar:[/B][/U]
[•]Navbar invert layout.
[•]Enable/Disable Navbar.

[U][B]QUICK SETTINGS:[/B][/U]
[•]QS brightness slider position.
[•]Battery percentage selection.
[•]Auto brightness icon toggle.
[•]Brightness control buttons.
[•]Quick pulldown option.
[•]Kill app button.
[•]Vibrate on touch.
[•]Blur behind QS.
[•]QS panel Opacity.
[•]Tint QS toggles.
[•]Battery Customization.
[•]QS Header.

[U][B]LOCKSCREEN:[/B][/U]
[•]Lots of new Clocks
[•]Lots of Fonts for Lock, Date and Owner Info.
[•]Lots of new Date styles.
[•]Charging info.
[•]Fingerprint Authentication Vibration.
[•]Unlock keystore with fingerprint after reboot.
[•]Lockscreen Weather.
[•]Lockscreen visualizer.
[•]Lockscreen media art and Blur customization.
[•]Disable Quick Settings panel on secure lockscreen.
[•]Lockscreen charging animation.

[U][B]BUTTONS:[/B][/U]
[•]H/W keys customization.
[•]H/W buttons backlight customizations.
[•]Power Light control.

[U][B]NOTIFICATIONS:[/B][/U]
[•]Headsup Customizations.
[•]Incall Vibrations.
[•]Less boring Headsup.
[•]Headsup snooze & timeout option.

[U][B]MISC:[/B][/U]
[•]Three Finger Screenshot.
[•]Wake on plug.

[U][B]Others:[/B][/U]
[•]Doubletap or longpress power to toggle flashlight.
[•]Vibrate in in-call settings.
[•]RGB Accent picker.

[/LIST]

[LIST]
[U][B]Changelogs v3.9:[/B][/U]
[•]July security patch (r40)
[•]Removed selinux switch
[•]Improve fod
[•]Swipe up on keyguard to use FU
[•]Fixed edit tile keep pressed while not expanded
[•]Fixed double tap to check phone
[•]Fixed SystemUI crash with custom volume panel
[•]Change default scale animations
[•]Improved gaming mode
[•]Disable notification vibration
[•]Improve edge lightning from ion OS
[•]Update interval weather
[•]Live data usage
[•]Added option for selecting SBC HD codec by default
[•]Added option for a2dp codec priority
[•]Added fod pressed
[•]Added Quick QS brightness slider
[•]Added Color OS 7 FP animations
[•]Added realme pressed
[•]Added Ancient FOS
[•]Added Pattern 4x4 - 6x6
[•]Added toogle for gradient QS Background
[•]Added QS Tile Styles (also add ancient tiles)
[•]Added QS Clock Style
[•]Added QS Analog Style
[•]Added QS Themes
[•]Added Settings Style
[•]Added statusbar height for dual row
[•]Added Settings dashboard icons
[•]Added slim recents
[•]Added Switch Styles
[•]Added QS Label options (accent, gradient)
[•]Added new QS tint
[•]Added disable quick settings on LS
[•]Added Quick settings pulldown
[•]Added Smart Pulldown
[•]Added LiveDisplay
[•]Added sensor block package list
[•]Added QS tint mode (random, disco)
[•]Added toogle to hide lock icon on LS
[•]Added Ancient Widget Clock
[•]Added longpress power to toogle torch
[•]Added allow VPN Tethering
[•]Added Notifications ticker
[•]More

[/LIST]

Download ROM here for your device!

ROM: https://sourceforge.net/projects/ancient-pyxis/files/

Gapps: Your choice which you wanna use

Recovery:You can use any which you prefer

Magisk (Optional): https://xdaforums.com/apps/magisk/official-magisk-v7-universal-systemless-t3473445

Flashing Instructions

CLEAN FLASH :

Download the latest build and GApps

Reboot to recovery

Take Backup (Not Necessary, Still its Recommended in case)

Wipe System, Data, Vendor, Cache & Dalvik

Flash the ROM + Gapps + Magisk (Optional if want Root)

Reboot

DIRTY FLASH :

Download the latest build

Reboot to recovery

Wipe Cache & Dalvik

Flash ROM Zip file

Reboot

Note : GApps and Magisk is to be flashed every time you Dirty Flash the ROM.

AOSP

LineageOS

SuperiorOS

DotOS

PixelExperience

AospExtended

Syberia OS

Nitrogen OS

Pixys OS

ArrowOS

MSM-Xtended

HavocOS

BootleggersROM

ABC

Rebellion

Komodo

Durex aka Corvus

DerpFest

Evolution-X

OMNIROM

AOSIP

Liquid Remix

Resurrection Remix

Dirty Unicorns

Bliss

ExtendedUI

AICP

MoKee

RevengeOS

Yodita

POSP

ION

crDroid

GZOSP

Colt-Enigma

AncientOS Source

Ancient-Device Sources

Kernel Source

Telegram Group

Telegram Channel

Telegram Device Specific Group

REPORTING BUGS!

As soon as the problem occurs, take a logcat!

for more READ THIS

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