I have installed first my device, worked without problem but when I wanted to remove the sim card it was stucked because of the adhesive paperback what I put on the sim card bracket.

I removed the SIM card with a screw driver but I have screched the PCB. After I put the next sim card is was written that no sim card inserted. (I have resetted, reinstalled, did everything after it, but still) So I guess it is becuase I scratched the PCB. 

If it is not problem what else can cause the problem? How can I solve it? What I assume some paper stucked under the sim card holder and it can also cause this problem but I have also brused inside the pocked and can not find anything.