[ROM][10][BETA][a71n][a71] Havoc OS [3.7] for Galaxy A71 [U2]

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Senior Member
Apr 27, 2017
Cebu City
Sir how did you make device tree vendor and kernel...
Sorry for asking i want to build my own ...
I tried a lot read and read and tried a lot with no succes...

Tbanks sir
If possible just give me some idea.

This ROM/OS is currently using stock vendor which means that the .zip is only containing SYSTEM and there is no VENDOR files to be flashed. That's why there is no vendor tree released nor pasted in the post. Then why we didn't use and inherit vendor files? Well its because we are facing bootloops and errors. We are still investigating and fixing the problem. How about the kernel? Well you can look on first OP post, there is Kernel Source link attached on it, feel free to use it and compile it and fork and modify it! Well I can't teach you how to compile and build some custom ROM/OS. Me too is studying them a lot of time how to build and compile ROM/OS. I took few months to understand how it is done. I also did not make the tree, the tree I got is ported & copied from LineageOS tree, and modified by my team. What ROM/OS you gonna make and compile though?
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Senior Member
Apr 27, 2017
Cebu City
Also there is tons of guides you can find it on the xda devs forum and threads, Goolge forums and some communities that provide guides and steps to make your own ROM/OS. I can't give a guide and steps here becuase it will take long messages and steps that are not intended to be here.
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New member
Jun 28, 2020
Also there is tons of guides you can find it on the xda devs forum and threads, Goolge forums and some communities that provide guides and steps to make your own ROM/OS. I can't give a guide and steps here becuase it will take long messages and steps that are not intended to be here.
Thank you so much for your efforts. I appreciate for that .
I am noob ,and i have little knowledge.
So asked you.
Thanks for the rom
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Senior Member
Apr 27, 2017
Cebu City

Development temporarily postponed since next kernel source code is currently not available/delayed, and I don't have any server left/available to compile, build/release another release or update of this custom ROM. We are sorry for postponing the development. We hope you will understand us. We are open for help and support just join us through our A71 Telegram group (check OP post).


Senior Member
Apr 27, 2017
Cebu City
Second Announcement:

I'm sorry to tell you this announcement peoples, but I'm gonna permanently end the support for Galaxy A71. Sorry to hear that, but I will not release any new version and new ROM forever. Gonna thank you for the peoples who supported and helped me though.

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    Havoc-OS 3.x is based on AOSP, inspired by Google Pixel.
    Has a refined Material Design 2 UI crafted by @SKULSHADY.
    Many useful features that will blow your mind.
    All you can dream of and all you'll ever need.
    Just flash and enjoy...

    Fingerprint not working
    Bluetooth currently 75% working
    MTP currently not working
    Tell us what more


    Material Design 2 UI
    Android R Style Screenrecord Dialog
    Rounded UI
    Inbuilt GApps (optional)
    Face Unlock
    Enhanced QS Battery Estimation
    Lockscreen Clocks
    Font Customisation
    Dark Theme Support for AOSP apps
    Notification LED Settings
    Pixel Lockscreen weather
    Signature Spoofing
    Micro-G support
    Lockscreen charging animation
    [SIZE="3"][B][U]Status Bar:[/B][/U][/SIZE]
    Clock & Date Settings
    Custom Logo
    Brightness Control Gesture
    Double Tap to Sleep
    Network Traffic Indicator Settings
    Carrier Label Settings
    Battery Icon Style/Percentage Settings
    Status Bar Icons Toggle
    HD/VoLTE Icon Toggle
    4G/LTE Icon Toggle
    Data Disable Icon Toggle
    Roaming Indicator Toggle
    Small Mobile Type Icon Toggle
    Bluetooth Battery Status Toggle
    [SIZE="3"][B][U]Quick Settings:[/B][/U][/SIZE]
    Quick Pulldown
    Smart Pulldown
    Battery Estimates Toggle
    Background Opacity
    Background Blur Configuration
    Header Image Configuration
    QS Customisations
      Tile Title
      Vibrate on Touch
    Brightness Slider Customization
      Brightness Slider On Bottom/Top/Hidden
      Auto Brightness Icon
      Brightness Control Buttons
    QS Footer Customization
      Settings Icon
      Running Services Icon
      Edit Icon
      User Switcher Icon
    [SIZE="3"][B][U]Ambient Display:[/B][/U][/SIZE]
    Show/Hide Battery Level
    Ambient Options
      Always On
      Always On When Charging
      Wakeup On New Notifications
      Wakeup on New Music (Music Ticker)
      Sensor Based Screen Wakeup (Tilt/Hand Wave/Pocket)
      Double Tap for Ambient Display
    Ambient/Always On Display Brightness Configuration
    Corners Customisation
      Rounded Corner Radius
      Corner Content Padding
    Legacy App Scaling
      Force Higher Aspect Ratio for Selected Apps
      Nav Bar Toggle
      System Navigation Type
      Arrows Keys
    Volume Buttons
      Swap Keys
      Volume Steps
      Long Press to Seek Tracks
      Keyboard Cursor Control
      Volume Rocker Wakeup
      Volume keys Answer Call
    Power Button
      Power Menu Customization
      Lockscreen Options
        Visibility on the Lockscreen
        Advanced Reboot
        Screenshot Option
      Screen-Off Torch
        Double Tap Power Button
        Long Press Power Button
    Back Gesture
      Arrow Animation toggle
      Long Swipe Type (Swipe and Hold/Swipe Edge to Edge)
      Long Swipe Timeout
      Long Left/Right Swipe Action
      Haptic Feedback toggle
    Jump To Camera
    System Navigation Settings
    Prevent Ringing Gesture
    Swipe To Screenshot
    Touchscreen Gestures
    Double Tap to Sleep
    Media Cover Art
    Media Cover Art Blur Level
    Music Visualiser
      Pocket Detection
      Screen Off FOD
      Show Icon
      Recognizing Animation
      FP Authentication Vibration
      FP error Vibration
    Elements Customisation
      Status Bar
      Quick Settings
      Lock Icon
      Charging Info
      Blink for incoming call
      Blink for Call Waiting
      Edge Lighting Customisation
    Status Bar
      Heads Up
      FC Notifications
      Kill App Button
      Noisy Notifications
    Animation Duration
    System Animation customization
    QS Tile Animation Customisation
    [SIZE="3"][B][U]Battery Saving:[/B][/U][/SIZE]
    Smart Pixels
    Suspend Actions
    Gaming Mode
    Wake Up on Charge
    Charging Animation
    Screenshot Type (Full/Partial)
    Adaptive Playback
    Playback Timeout (30sec/1min/2min/5min/10min)
    [SIZE="3"][B][U]Other Features:[/B][/U][/SIZE]
    Vibration & Haptics Customization
    Notch Hide Settings
    Seperate ringtone for SIM1&2
    Screen Refresh Rate (For Supported Devices)
    ALways On Display
    Smart Charging
      Styles and Wallpapers
      Dark Theme
      Accent Colour
      Icon Shape
    [SIZE="3"][B][U]QS Tile Shortcuts:[/B][/U][/SIZE]
      Heads Up tile
      Caffeine tile
      CPU info tile
      Smart pixel tile
      Live Caption
      Screenrecord tile
      Gaming Mode tile
      Screenshot tile
      LTE tile
      Music Tile
      Switch Data Card Tile
      Reboot Tile
      Reading Mode
      Gaming Mode
      Sound Search
      Compass Tile


    Founder & Lead Developer:
    SKULSHADY (Anushek Prasal)

    Support Team:
    theo.j22 (Tushar Jain)



    1.) Use & Flash Lineage Recovery made by faizauthar12
    2.) Factory reset "DATA" ONLY!
    3.) Flash Havoc0S using ADB Sideload. Flash stock17n_kernel.zip made by faizauthar12
    Notes: You should flash stock17n_kernel to fix audio problem or else you will end up with no audio and no audio drivers. Look for Lineage OS thread for download of stock kernel
    4.) Flash GAPPS and any other things you want using ADB Sideload
    5.) Reboot System! & Profit?


    Head of Device A71 Havoc:
    Erza07 (Nothing/G4Y-HUB)
    The Legend Dev & The One:
    faizauthar12 (Faiz Authar)
    Me? Why Me? Why?​
    LineageOS (https://github.com/LineageOS)
    Crdroid (https://github.com/crdroidandroid)
    Pixel Experience (https://github.com/PixelExperience)
    Nitrogen Project (https://github.com/nitrogen-project)
    Omnirom (https://github.com/omnirom)
    And all the other Developers, Testers, Donators and Users.


    More details:
    ROM OS Version: Android 10 Q
    CUSROM Version: Havoc 3.7
    ROM Kernel: Linux 4.14.117
    ROM Firmware Required: OneUI 2.0 (U2ATE8)​

    Status: Beta Testing (Active)

    Release v1.0 (Current):
    - Initial Release
    - Merge and Upstream Latest Havoc Update (3.7)
    - Latest Security Patch Merged


    Only Github Release

    Why I need to flash and use stock kernel?
    Stock kernel have a working audio and working audio drivers, since the Kernel Source Code released
    by Samsung Open Source have Audio (techpack) problem or broken (according to faizauthar12).
    I can confirmed it too. This is currently better Source Code than Galaxy A80 which is totally broken and can't be use.

    When support for OneUI 2.1?
    When Samsung will release the next Kernel Source Code, then it will be out sooner!
    Here we go! Some sweetness...!
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