I uninstalled the old version driver (1.67) and installed the new driver, without connecting the old 2014 Mini-i Pro.
After reconnected the old mini-i pro, my windows tablet detect it as Mini-i Pro while searching drivers, and successfully installed as Mini-i.
Then i reconfigured foobar, reselect mini-i pro under foo_dsd_asio and DSD Playback method selected Asio Native.
1. Playback DSD64 dff file and the mini-i pro displayed DSD2.8M, and playback properly, everything just fine, so i assumed Asio Native worked.
2. Playback DSD256 dff file and the mini-i pro displayed DSD5.6M, and playback properly, foobar display 11.2M (very long figure, used short form), again, Asio Native worked
3. change DSD playback method to DoP Marker, DSD64 played properly, DSD256 unsupported sample rate.
4. change to Asio Native, upscale DSD to DSD512, both dff files unable to play
5. upscale to DSD256, played DSD64 file, foobar shown 11.2M but Mini-i pro still shown DSD5.6M
Conclusion:
I) Asio Native worked, new driver worked on old 2014 model, DSD256 supported.
II) The display may only support max DSD5.6M, some more there is no additional space to show DSD11.2M (Can someone confirm it on their new 2015 model?)
I didn't try digital volume, my setting always at line level.