How to make my 3D VR project run on an older Android?

I created a simple maze project that compiles and runs on Unity. and the goal is to run the app on my LG MS870 I think its running 4.0 (its a few years old)

I had followed instructions to install the SDK and selected build versions all the way back to 4.00 and it took a LONG time to download and install all of them.

now I set the phone to Developer mode, connect by USB and do the Build & Run and it compiles and take a couple minutes and says uploading to LG MS870… complete. it starts in developer mode sometimes and has a blank screen, then black Unity screen, then its back on the menu like nothing happened. gone.

I had this happen on my new phone, its an A571VL made by TCL communication ltd, cant remember the other brand name it shows, got this for $10 at the grocery store, small screen. The LG has a larger screen.

Am new to Unity, want to develop for these VR applications but what settings might be preventing the phone from running the app?
thanks

I’m pretty sure VR on Android requires minimum Android 4.1

ok and its 4.0 ice cream sandwich. just need a newer phone, thank you.