Does unity really support ASTC?

I'm running a game with ASTC texture compression, however I'm using ADB to check what's actually happening at runtime.

I get several messages telling me

"WARNING: no native support for texture format 5, converting to 4!"

I'm getting t$$anonymous$$s message w$$anonymous$$le running my application on a note3 (w$$anonymous$$ch does support ASTC)

There is no decompression, just a conversion.

On a device that does not support ASTC (Nexus 10) ADB tells me the device does not support, and decompresses it then and there, resulting in huge loading times.

On a note3 the loading time is fine but I'm still getting t$$anonymous$$s warning.