Download/Install AOSP Android 11 for Xiaomi Mi 9

Here in this tutorial, we’ll be sharing the easy guide on how to download and install the AOSP Android 11 firmware for your Xiaomi Mi 9 device. Last month, Google has released the much-awaited Android 11 OS which is a successor version of Android 10. Now, more and more custom firmware developers are working hard to build their respective aftermarket ROM for the bunch of Android device models. There is good news for all the Xiaomi Mi 9 users as they can now easily get and install the AOSP firmware on their devices based on Android 11.

It’s also notable that AOSP (Android Open Source Project) firmware comes with the latest Android OS version along with multiple features, customization options, and more. But the Custom ROM always comes with multiple bugs, stability issues, lacks official OTA firmware updates, lacks the latest security patch updates over the timespan, and more. So, if in case, you’re one of the heavy users and works a lot with your smartphone, we won’t recommend using this firmware as your daily driver on your primary handset.

Now, you may ask what is the actual name of this AOSP Android 11 firmware? So, it called Fluid 1.0 OS. It’s based on Android 11 AOSP ROM that works really well in terms of performance or features. Currently, the firmware is in the beta testing phase which will be getting better in the future until stable version releases. It’s the latest edition of popular firmware like CarbonROM and RevengeOS.

Download/Install AOSP Android 11 for Xiaomi Mi 9

The installation is pretty simple and easy. If you have installed any custom ROM before then you will have no issue flashing the ROM as the process is exactly the same. But before proceeding to the installation let me clear that this build is in the very early stage which means there will be bugs and many functions may not work properly. So, we do recommend not to flash the ROM on your primary device. Thanks to the XDA member Dyrex2004 for sharing this build.

Download/Install AOSP Android 11 for Xiaomi Mi 9


– FOD (probably fixed in future builds)
– SELinux permissive for now
– Phone is charging, but Android says it isn’t
– Set the Phone App as default in settings, or the call overlay won’t work!


  • Enable USB Debugging on your Mi 9. Settings > About Phone > Tap on Build Number 7 times > Go back to Settings > System > Advanced > Developer Options > Enable USB Debugging.
  • Also, enable the OEM Unlock from the Developer Options.

Samsung Galaxy usb debugging

  • Make sure the bootloader on your device is unlocked and your device is rooted and you have a custom recovery installed.
  • Make sure your device has more than 50% battery.
  • Download and install the Android USB Drivers on the PC.
  • Make sure you have taken a backup of your important data. Now proceed to install Fluid 1.0 OS ROM (Android 11) on your Mi 9 device.
  • Make sure that you have installed TWRP recovery on your Android device.
  • Ensure that your Xiaomi Mi 9 handset is running on the MIUI at least.

Disclaimer is not responsible for any damage happened to your device(s) while following this guide, proceed at your own risk.

Download Link:

Flashing Steps: Fluid 1.0 OS

  • Make sure your device is rooted and have the latest TWRP recovery installed. (Check the Pre-Requirement Section Above)
  • First, download the files from the above link and extract them.
  • Now transfer the downloaded files to the internal storage of your device.
  • Ensure that the bootloader is unlocked.
  • Now reboot to the TWRP recovery.
  • Take a Nandroid backup by selecting the option from the home screen and then your data and cache from the recovery menu.
  • Now return to the main menu of TWRP and wipe cache, data, and system before flashing the ROM


  • In order to Wipe data: Go to Wipe —> Advanced Wipe and select Dalvik/ART cache, cache, System, Vendor, and Data and then swipe to wipe. (Don’t select the internal storage)

TWRP Wipe Swipe

  • Now return to the main menu of TWRP again and install the ROM which is just a .zip file
    • Go to Install -> Install Zip > ROM File (.zip)

TWRP 3.0 RMG Install

  • Next flash the Gapps file like custom ROMs
  • Now, go to the main menu of the TWRP Recovery > Tap on Wipe > Select Format Data.
  • It may ask you for the command. So, type yes and tap on the tick mark to confirm.

Once the flashing process is completed, reboot your Mi 9 and you will be booted into Fluid 1.0 OS ROM Based on Android 11. If you have any doubts regarding this process, feel free to comment below.

Subodh Gupta
Subodh Gupta
Subodh is from Kolkatta. He has been covering Windows, Apple and Android news and guides on RMG network

Leave a Comment