CBE Camera Repair Services - Nikon D90 "Err" / "error" fixed and solved! 😎👍 It is a Nikon d90 common problem, when mirror stucks up it will show an err like this.
Nikon D90 Mirror Stuck - YouTube
Заклинивающее зеркало и "Err" на дисплее - ремонт Nikon D90
Nikon DSLR Error Codes. Know Possible Ways to Fix Errors
Nikon D90 with the message of Err. - YouTube
Nikon D90 err repair, Photography, Cameras on Carousell
Nikon DSLR Error Codes. Know Possible Ways to Fix Errors