Save your .hex files on SDcard, select one in menu with the buttons Up and Down, then press Ok to program the controller.

Supported controllers for program: Atmega 328p

For reboot programmer send reboot from controller. For load another file send load:filename.hex

Programmer <-> Controller

D3 --------- SCK

D5 --------- Reset

D6 --------- MISO

D7 --------- MOSI

Programmer <-> SD

D4 ------- CS

D11 ------- MOSI

D12 ------- MISO

D13 ------- SCK

Programmer <- Buttons

A0 -------- Up

A1 -------- Down

A2 -------- Ok

D8 -------- Cancel

Projects: Simple OLED game console: https://easyeda.com/Forem/multi