If you want to program KeyChainino V3 (64 LEDs) and V144 (144 LEDs), follow this guide:
==> How to program KeyChainino V3 and V144 via ISP
If you want to program KeyChainino V1 or KeyChainino THT (V1 or V2), follows these steps to program them with Arduino or an ISP Programmer:
==> How to program KeyChainino V1 and THT via ISP