Easytether on Convexa-S GL-S1300

I have Convexa-S GL-S1300.

What Easytether driver do I install from the list?

I know this is a 4x ARM Cortex A7, Quad-core CPU but don’t see the specific name on this list when you download the drivers for 15.05.1 here:

Also, cannot upgrade past 15.05.1 I think, correct?

S1300 factory firmware is compile using older toolchain, that’s binary imcompatible with the prebuilt easytether ipk.