I am new to unity 2021.2.10f and I have become stuck on getting a simple app working on a tablet /real hardware. I am using unity 2021.2.10f my project is simply the built in "3D Sample Scene(URP)" I did not change anything to it except added an icon to it (so I can see it in the tablet menu when it is installed on the android tablet)- the unity project can easily be recreated-I could not upload it since it the project was large (more than 350MB) for my internet connection.

This is how the the unity project looks on my computer

Then I re-opened it, this makes unity convert the project so it works in the latest version of unity 2021.2.10f-then I can see the GLES 2 (depreciated) appears in the latest version of Unity. The GLES2 option circled in blue shown below

-GLES 2 support does not appear in the project if the project is not converted from the older version of unity.

Now I can use the latest version of unity to use with a tablet that supports only GLES 2 by adding to the empty test program to eventually write my complete program.

I am happy I can still use my tablet with unity because: it wasn't cheap to buy and bought this year, if it works on this tablet it will work on a GLES3 tablet (because of backwards compatiability).