Quectel RM502Q-AE No service problem

We have bought 14 RM502Q-AE modules, however one of them is not getting any service whether it is 5G or LTE while others can dial up to 5G cellular network. I had tried updating the firmware and changing the sim card and slots but only this particular module is getting no service at all. Is there a way to solve this problem?

Dear @Lucas_Cheong_Wai
I will share the tool and user guide to backup QCN, please follow it and share the file to us.