Not sure what QCN backup is.
Don't know how you would go about repairing it though I did see results in a google search. However, on the OnePlus 7T Pro 5G McLaren, your IMEI number can be found on the back cover of the phone under "McLaren". If you weren't looking for it and/or use a case like most do for this slippery phone, you'd never see it because it's grey and blends in with the McLaren Pattern on the back.Hey guys.. my imei got wiped and if there is a way to repair it ..that would be great.
Thank you