[Redmi 9A ROMs, Kernels, Recoveries, & Other Develo] Ivan.Adriazola:
Good for you.

I think there are debloated ROMs that would be easier to flash, but thats beside the point.

To answer your question, Im not sure, I also saw those options and if youre talking about the same ones I saw, I think those options wont do anything Im pretty sure I tried them but nothing happened, in any case maybe I was just lucky and I know how to unbrick my device so I was pretty reckless on every stepof the way.

Now, if youre talking about dirtyflashing magisk.zip, thats not recomended since android 10 IIRC, it works sometimes but for reasons out of my knoledge, its not recomended.

The recomended method of flashing right now is installing the latest official, magisk APK you get from here and installing it on your phone

you should have a an A-only device since our devices are the same but I would check it throuhg adb, Orange Fox has a nice guide on how to do it.

if you do indeed have a A-only, get the boot.img thats inside the ROM you installed, (im pretty sure it has to be the fastboot one, but dont quote me on that) its supposed to be on

...\ROM\images\boot.img

put it on the phone SD card

open the app and check that the RAMDISK says yes (again it should be since my phone is and yours is the same, but check it.

if so, open magisk app, tap on install;

options: select the patching vbmeta (the option has to be activated, I think this will bootloop your device otherwise)

tap on next

method: select and patch file

tap on lets go

The Magisk app will patch the image to

[Internal Storage]/Download/magisk_patched_[random_strings].img.

copy that to your pc, Magisk says to use adb but its not necesary you can use file transfer using a cable, copy it specifically to your .../adb/platform-tools folder, change its name to "magisk_patched.img"

open CMD, and go to your .../adb/platform-tools folder using the cd command

once there you run fastboot flash boot /path/to/magisk_patched.img

and youre done, you should have rooted your device.

No problem, as a final note, I recomend checking the "official guides", its not that I did something so different, I just did what worked better for me as a total n00b, but what I did was specific for my device and I made it up as I went, Im not responsible if anything bad happens to your device for blindly followig my guide, but the same goes for anything you do to your phone really, so there, I hope it helps you.

I rooted my device with these, its a bit overwelming to look at it but its way simpler, you just need to skip the steps that are not for our device., if you run into issues or doubts come to this comment to check how I did it, but thats about it.

Installation

The Magic Mask for Android

topjohnwu.github.io

How to Install Magisk on your Android Phone

Magisk is a powerful tool that can help you customize some aspects of your phone or even grant you root access. Here's how you can install it!

www.xda-developers.com

Oh and one last thing, It said on there that rooting requires a full data wipe? I didnt do that, I thought it would do it on its own while, before or after flashing boot.img, It did not. I dont know if I was suposed to do it or what but.. yeah, that happened.