Multiwi & Megapirate Flight Controller

Dear All,

I need to help to one school student to program his flight controller ( Quad copter)

Board type Multiwi & Megapirate Flight Controller

AIO PRO V1.0
CRIUS
I am good familiar with ARDUINO IDE
Can any one should help me program this board
I tried you tube and varies web tutorials but still little bit confused

Please find the attached for image of board

Thanks in advance
Please advice

A simple search turns up this pdf showing how you use the Arduino IDE to program the board.
https://www.hobbyking.com/hobbyking/store/uploads/998673411X846863X42.pdf

HI
WP100

I have it but advice is needed
It shows multwii_2_1 crius AIOP firmware but firmware folder it does not have

any experience advice