[Redmi Note 9 Guides, News, & Discussion] mirzanuman6612:
DISCLAMER!​

Follow the instructions shown in this thread at your own risks, I will not be held responsible for bricking your device, you did this yourself.

That said, the information will be kept up to date relatively frequently, and should you follow the steps and ask questions below when unsure, everything will be fine!

No files will be directly provided. Do not use pre-created/re-uploaded content.

Note: This is a GSI (generic system imaging) ROM and the credits go to @eremitein and the link to his thread is below:

[OFFICIAL CAOS GSI]

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The download link to the rom is below:

Click here to download the ROM

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Here are some requirements to install this ROM on your device.

1. You must have a PC

2. The bootloader of your device must be unlocked. (if you don't know how to unlock the bootloader of your device then the instructions are below.)

3. Your phone's battery must be above 50%

4. You must install this ROM with a clean boot.img. (it is recommended to install this ROM with a clean boot.img, installing this ROM with a patched boot.img can often result in bootlooping/bricking the device.)

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Here's how you can unlock the bootloader of your device.

1.Create a Mi account if you already don't have one.

2. Open up your phone and go into the settings and go into "About phone" then tap on the MIUI version 7 times. (you will unlock the developer options)

3. Now go back from about phone to the settings app and scroll down to "Additional settings" scroll down and you will see "developer options"

4. Open the developer options and turn on "OEM unlocking" and then click on "Mi unlock status" and now turn off the WiFi and turn on your mobile data. Now click on "Add account and device"

5. Go back to the developer options and scroll down and enable "USB debugging"

6. Now go onto your PC and head over to this link (https://en.miui.com/unlock/download_en.html) and download and extract the file that has been downloaded.

7. Go to the exctracted folder, locate and open the .exe file named "miflash_unlock"

8. Login with your Mi account.

9. Connect your device to the PC via a USB cable. (the one that comes in the box is recommended)

10. If the drivers are installed and the device is connected properly then you must see a "Unlock now" option click on it and you will get a 7 days waiting time.

11. After 7 days, try again and if nothing goes wrong your device will be unlocked.

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Now onto installing the ROM:

1. First download and extract this file on your computer SDK Platform tools

2. Download this file and extract it on your computer MIUI 12 ROM download the fastboot file and extract it on your computer.

3. Download the custom ROM and extract it. (the download link is above)

4. Copy and paste the file to the SDK Plaltform tools folder rename the custom ROM file to "system"

5. Copy the vbmeta.img from the MIUI 12 RO folder and paste it in the SDK platform tools folder.

6. Head to your device and power it off, once it is powered off, Hold the volume down button and the power button till the fastboot screen shows up.

7. Now connect the device to your computer and on your computer open the SDK Platform tools folder and make sure that those 2 files are there, "system.img" and "vbmeta.img"

8. Right click and press the shift key at the same time and click on "Open powershell window here"

9. Now in the powershell window, type in the following codes:

.\fastboot.exe reboot fastboot
.\fastboot.exe --disable-verification flash vbmeta .\vbmeta.img
.\fastboot.exe flash system .\system.img
.\fastboot.exe -w
.\fastboot.exe reboot

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If you followed the all steps then your device will be booted up with Android 11.