Yeah have not visited this site for a while. Also have not 'touch' my camera for more than a year due to covid. Today, try to shoot a video and my D610 show Err. Panic and search the web on how to diy.
Various advices on cleaning of contact point, to trying to manually flip the mirror or reset. End of the day, I adjust to mirror up and then shoot and everything back to mormal. I did hear the mirror filp then nothing happen. So, sharing here should anyone face similar problem, try this first.