How to get AR apps run even on Unsupported Android phones ?

Hi all,
I'm trying to learn AR and build apps into my old Android phone. I downloaded AR Foundation sample 5.1 and whenever I build it into the phone, it always said "This app requires the latest version of Google Play Services for AR". But I can't download the service as it's not supported on my phone (from Google ARCore supported devices list).
After setting ARCore optional (Project Settings > XR Plug-in Management > Google ARCore), the whole screen is blank.

However, AR apps from Google Store still some how work on the phone:
ARloopa - working face recognition, slightly inaccurate plane tracking.
Fectar - doesn't have any working tracking at all, but I can still open the app and view models along with camera.

So my question is, how can they make AR run on unsupported phone ? Are there anything I can do to at least has it function like ARloopa ? Thank you

My phone:
Xiaomi Redmi 8 2019 - MIUI Global 12.5.3 - Android 10

Unity 2022.3.20f
AR Foundation 5.1.2
Google ARCore XR Plugin 5.1.2
XR Core Utilities 2.3.0
XR Interaction Toolkit 2.5.2
XR Legacy Input Helpers 2.1.10
XR Plugin Management 4.4.0

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The definition of "unsupported" means that ARCore does not work on the device. There is nothing you can do to enable ARCore support on the device.

Thanks, so what you meant is that AR apps that I found on Google Play (and still functional on my phone) use different AR engines than ARCore, right ?

Presumably yes, but I'm not familiar with any of the apps you are talking about. This is really a question for Google and/or the developers of those apps.

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ARLOOPA has its own engine for AR which they sell.

It can be a Pseudo AR Experience that uses only the gyro and camera feed, like in my AR Camera Lite.

Example of AR Shooter with pseudo AR that doesn’t require ARCore:

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Thanks for clarifying :)