Error Code Ricoh MP C4500 Service Call Error

Hi There,

I was wondering if someone could help me get my machine working again. The error I am getting is SC820 Self Check Diagnostics Error Code 4002.
According to the service manual it could be a defective control board or a firmware issue.

I would like to try and reinstall the firmware before I figure out what to do next however I do not have access to Tessa as I am not trained and do not work for a certified company.
If someone would in the first place be willing to supply me with the Controller Firmware I would be most grateful.

Best Regards,
Aleksander