Thanks a lot.
The installation went without a hitch.
The camera works much better than in 20.04.
voLTE is still fully functional on my Redmi Note 9 Pro in Belgium with Orange.
There's still the known problem that prevents Bluetooth pairing with the car.
As for the rest, I'm happy to adopt it, the OS is superb!

@projectmoon
And it's an extraordinary piece of work and a valuable tool in my everyday life!
Thank you for that!

@O.o.
Welcome!
I made this choice a year and a half ago and I have never regretted it.

@libremax
Extremely interesting.
Necessary information that I was missing...
Thank you for sharing, and a thousand thanks to Alfred and those who make this possible.

@domubpkm
Glad to hear it!.
In the next release, i'll fix this size and will add global theme changes and relooking.

@Technotramp
Could you read this discussion, it's a good start place.
https://forums.ubports.com/topic/9957/installation-guide-redmi-note-9s/26

@Lakotaubp
Confirmed

@uxes Xiaomi Redmi Note 9 Pro (miatoll joyeuse global)
getprop | grep incremental
[ro.system.build.version.incremental]: [986]
[ro.build.version.incremental]: [986]
[ro.odm.build.version.incremental]: [V12.0.1.0.QJZMIXM]
[ro.vendor.build.version.incremental]: [V12.0.1.0.QJZMIXM]
Hallium 10.
20.04 Stable with folowing tweaks and 24.04 daily (without any change).
Operator is Orange Belgium
voLTE, SMS, MMS, access point are OK.
volte.txt

@sixwheeledbeast
Hello.
Did you checked the usb parameters in System parameters?

@lolo
I would say that the ROM depends on the Redmi Note 9 Pro model.
The model is usually printed on the back of the phone under Redmi.
This phone has had many variations depending on where it is sold. (Global, Turkey, India, etc.)
The global model is M2003J6B2G and need joyeuse_global_images_V12.0.3.0.QJZMIXM_20210419.0000.00_10.0_global_0801ff7d09

You can get info with
adb shell getprop | grep incremental
adb shell getprop ro.product.name

In fastboot mode (Power and Volume down until Xiaomi rabbit)
fastboot getvar product

Tell us wich model and which phone you have and I'll try to find the right ROM to install before install UT.

@PhAndersson
OK

@PhAndersson
We can arrange a meeting place if you wish.

@AppLee
I'll do, I have a beautifull sweat UBports.
Will have my phone and maybe print some sheets with key features for people interrested in.

@AppLee
I'll try to make myself available to be there on Saturday.

@Ruesaga
I find that these phones work really well with UT. My preferred ROM for the 9 Pro is the joyeuse_global_images_V12.0.1.0.QJZMIXM_20201107.0000.00_10.0_global_eb964f842a
But recommended is 12.0.3

@Ruesaga
I have two Xiaomi Redmi Note 9 Pro.
One for tests (and back up) and one for my daily use. (20.04 several OTA, and actually one on 24.04-1.x Stable and the other under 24.04-2.x)
I have flashed with ubport installer more than 30 times each one.
Starting from the right Android Stock ROM, I never had any problem with any parts of those phones. All is working well.
As UT is talking with Halium (10 in my case) and Halium is talking to previous Android parts left in place during install, the previous Android MUST be the right one. Not near, not another.
Now, I can only refer to my experience...
My FAI device, the mobile network from Orange.

@lolo
If it's global
https://xiaomirom.com/en/download/redmi-10x-4g-note-9-merlin-stable-V12.5.4.0.RJOMIXM/
Choose the Fastboot ROM
But there are specific ROM for models for India, Indonesia, Russia, Turkey, EEA, Global, China.

@lolo
What is the Model of your phone printed at the back?
https://devices.ubuntu-touch.io/device/merlin/

@mrt10001
Any idea?