Cisco Aironet 1700i IOS Autonomous

I hope someone can help me here. I borrowed a Cisco Aironet thats been sitting around in the office, im thinking of messing around with it with my homelab, unfortunately its a lite version and i need an Autonomous IOS version. We dont have Cisco service account so i cant download it from their website. Is there any other place where can i get the IOS?

Thanks in advance.