X-Sight 4K balistics questions

I'd like to understand some of the entries when entering a profile on this scope.

Can someone explain Drag function, Ballistic coefficient and Sight height? Is sight height the perpendicular dimension from center of bore to center of optics?

I'll be using this scope on an FX Impact M4 Sniper .22 cal.

BTW, concerning the firmware update, the file I got off the web was "xsight4k_3_1_12_510.bin". The firmware in the scope was version 3.1.12.511 which appears to be newer. I saved the downloaded file on the SD card but the X-Scope never asked to update the firmware or run through any auto update either. I couldn't find a manual way to update it either.

So what firmware version is current?

Thanks
 
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