Help fried ECU?

I recently purchased a 2011 renegade 800 for parts or fix up. When I turn the key on it displays a bunch of backwards R’s with a check engine light. After a minute or so it says "New Ecu recognized cluster will now reset." After resetting its blank and lit up with no letters. It says something about a security token lacking in my video it won’t let me upload it. It has no starter solenoid so I can’t start it. Will these things start without a cluster, or a cluster that isn’t working correctly? What would you buy cluster or ecu/key, or try something else? Thanks for help in advance.