[Redmi Note 9T] chmick:
## first version , errors may still occur

Hi everybody, as a noob in the rooting world , here is my small contribution. A step by step how-to , to completely root + installing a custom.

DO NOT HESITATE TO COMMENT SO I CAN IMPROVE THE DOC:

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Read the complete procedure carefully before start: Beware you will loose all data you may have on the phone .and you will loose warranty .

## REQUIREMENTS :​

a brand new redmi note 9T (direct from the store, no modifications), a pc with windows , the usb cable to link the pc to the phone.

A sdcard where you can store the rom and some zip to put in your phone

Make sure the pc is up ot date with latest android usb driver and adb available :

usb drivers here : https://developer.android.com/studio/run/win-usb

adb software : https://www.xda-developers.com/install-adb-windows-macos-linux/

we also need 7zip https://www.7-zip.org/

Also try to update your phone with the latest MIUI version you can get (at the the time I'm writing this it should be MIUI 12.5, based on android 11).

To upgrade go to system/about phone/ tap on the MIUI logo/ check for update .

If your phone is still stuck to a lower version, you may trick it by changing the region (I choose hong kong) in system/additional settings/region

then try to check for MIUI update again.

## FIRST STEP : unlock the booloader .​

for this you need a xiaomi account (if you created one with your phone , use it)

You also need to enable developper mode in your phone , so you can access usb debuging . (see the video tutorial)

a video tutoriel here :

you will probably have to wait 168 hours before you can unlock the phone (Yes you're not alone to think it's annoying, do not hesitate to complain to xiaomi business department)

there is also this version of the unlocker (to bypass the wait time), but I have not tested it

Moreover the bypass works for devices not yet linked to mi account

Download MiUnlock_bypass_OTP.zip - Generic

Download file MiUnlock_bypass_OTP.zip - Generic - in MiFirm ✅ - Xiaomi MIUI Firmware - ROM - TWRP download free and max speed - The biggest Xiaomi Mi download

mifirm.net

Once your bootloader unlock you phone will be reseted and when you restart it you will be asked for the xiaomi account password again (and you need a network connection).

After completing the setup again, don't forget to reactivate usb debuging option .

### SECOND STEP download and save files​

In case your want to rollback, and also if your want to install magisk in some custom rom , you need to download the original MIUI rom here :

XM Firmware Updater

The ultimate script that provides firmware packages for Xiaomi devices.

xiaomifirmwareupdater.com

from the zip file , you need to extract the boot.img file and transfer the file on your phone

then the install on your phone the magisk apk file : https://magiskapp.com/#magisk-app-apk

run the magisk app , choose install magisk , select patch a file and choose the boot.img file then press the let's go button

Magisk will generate a patched_image_file in your download folder .

copy the patched image file to your sdcard.

on your phone you can install this : https://play.google.com/store/apps/details?id=tk.hack5.treblecheck

It will help you select the type of rom you need to download

Plug your phone to the computer , open a command shell in your adb fastboot directory and type :

adb devices

you should see something like :

List of devices attached

sceqxxxxxxxxxxk device

(if not check your phone screen ,if there is some grant access dialog)

download orangefox from here https://github.com/gsuzeda/twrp_cannon/releases/

put the vbmeta.zip and OrangeFox-R11.0-Unofficial-cannong.zip on the sdcard

put the recovery.img in the same directory than your adb fastboot program

download the latest magisk files release from here :

first the zip : https://magiskapp.com/zip/#download-now

and the apk file : https://magiskapp.com/#magisk-app-apk

and put them on the sdcard

download the latest of the custom rom you want to install. Based on this link (thank you @gsuzeda) https://docs.google.com/spreadsheets/d/1Nm1RAQ_kiSoSBgtzux8uKklLF9TF6-1QvIVCPzW3OCs/edit#gid=0

, I will try AOSP rom here : https://github.com/phhusson/treble_experimentations/releases/latest

but you can also try lineageOS here : https://sourceforge.net/projects/andyyan-gsi/files/

(if you choose AOSP , you can not install magisk , at least for now)

NOTE: If your choose another custom rom , remember you may also need to install google apps as a separate package .

Example for lineageOS , you can download the gapps (MindtheGapps for arm64 )here https://androidfilehost.com/?fid=2188818919693781601

and copy the file to your sdcard

The redmi note 9T code name is CANNONG . It uses ARM64 A/B IMAGES and we want vndklite (read/write on system)

This is important whatever the custom rom you choose to download and install

Now we prepare the image files from the custom ROM so we can choose between two install methods

METHOD ONE is flashing the system.img from the computer with the phone in fastboot mode plugged to the pc.

METHOD TWO is flashing a zip file with the phone in recovery mode (using the orangefox program or twrp)

I choose his method , because you can do all the operation from orangefox recovery

for method two we will use https://xdaforums.com/attachments/gsi_flasher_sdcard-zip.5183639/

(thank you @gsuzeda for the complete method here https://xdaforums.com/t/how-to-make...ung-galaxy-a51-super-partition-image.4216083/ )

unzip the gsi flasher somewhere on your PC (for me Mydocument\gsiflasher)

exemple usage with AOSP rom:

uncompress the system-roar-arm64-ab-vndklite-gapps.img.xz

copy the img file in the gsi directory of the gsi flasher and rename it system.img (so for me cp system-roar-arm64-ab-vndklite-gapps.img to Mydocument\gsiflasher\gsi\system.img).

then create a zip file with the 3 directories (gsi, META-INF, scripts) in Mydocument\gsiflasher using 7 zip , for example system-roar-arm64-ab-vndklite-gapps.zip.

And finally copy this zip to the root of your sdcard .

## THIRD STEP : install orangefox​

orangefox is a recovery program like twrp but with more option.

Check if you booloader is unlock in your phone by going to system\additonal settings\developper option\mi unlock status

If the booloader is unlock then you can install recovery orangefox .

Make sure than usb debugging and install via usb is checked in the developper option of your phone

power off your phone and restart your phone in fastboot mode (volume down + power )

plug it to your pc .

open a command shell in the directory were fastboot is installed

write the command :

fastboot devices

it should give you a list with your device

then write the command

fastboot flash recovery recovery.img

once the install complete reboot your phone in recovery mode with the command :

fastboot reboot recovery

once boot in recovery mode you should see the orangefox menu.

View attachment 5349227

Use the "Files" at the bottom at the screen explore to go to the sdcard and tap on the orangefox zip files .

then swipe to install

Once the file installed , the phone should reboot in recovery.

Then use the file explorer to find the vbmeta.zip

ttap the file and swipe to install

after the install the phone should reboot.

a simple check step to see if everything went right

## FOURTH STEP , test and install custom OS​

There is two method to install , via recovery or via fastboot

I choose to use orangefox recovery

via recovery

reboot in recovery mode (volume up +power)

Once booted in orangefox recovery

first format the DATA (using the wipe menu,and you need to type yes to confirm )

Then reboot to recovery (from the orangefox menu choose reboot then recovery)

once rebooted in recovery

wipe data cache and dalvik

then with the file menu of orangefox navigate to the root of your sdcard where you stored the system zip we created for example system-roar-arm64-ab-vndklite-gapps.zip.

tap the zip and swipe to install

(if your choose another rom , do the same thing to also intall the gapps zip file)

once the install complete

wipe data cache and dalvik

reboot the phone .

## FIFTH STEP check install​

your phone should now start with AOSP version of android and start the setup program.

If you get a message like your device is not play protect certified :

connect your phone to your computer, in a command shell type :

adb root

adb shell

sqlite3 /data/data/com.google.android.gsf/databases/gservices.db

select * from main where name = "android_id";

then copy the id number printed and go there :

Sign in - Google Accounts

and enter the id in the text box and press register

wait 15 minutes and reboot your phone and finish the setup process and connect to google store with your gmail account

If your installation complain about the sd card, choose format as external. (you may have to transfer the files of step one in the card again)

## SIXTH STEP : install magisk​

(DOES NOT WORK WITH AOSP ROM)

reboot in recovery.

in the orangefox file menu :

search your magisk.zip file on the sdcard , tap and swipe to install.

Then choose the patched_boot_img file and choose /boot to install

Then choose the vbmeta.zip and install

wipe cache and reboot

All you want to know about magisk is here : https://magiskapp.com/

### LAST STEP , secure back​

now disable usb debugging

unchecked the option : install app from unknow sources

### ROLLBACK​

In case you want to rollback to MIUI rom

go there : https://www.getdroidtips.com/guide-flash-miui-rom-xiaomi-devices/

and follow the chapter : the How to Flash Xiaomi Firmware via TWRP Recovery