If your recording to the SD card 24/7 if might be worth a format being something might have changed on the firmware update or indeed replace the SD card. Looks like you could have done that anyway...

Hi, I have two cameras C211 both hardware v2, one is on version 1.4.6 and connected to the Hub H200 first time and is working just fine, I then got another C211 which will NOT update to anything...