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Gadgethub 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 CHA Error engl - YouTube
How to fix Err on a Nikon camera 📷 - YouTube
How to Fix LG Dryer Error Codes D80, D90, and D95 - Fred's Appliance Academy