1. Check and clean simcard first, compare simcard with a good one, replace simcard if needed
2. Check and clean simcard connector, replace simcard connector if needed
3. If the problem not solved, check simcard circuit for broken circuit. (as shown)
4. If the problem not solved, resolder simcard IC (emif/simcard), replace if needed
5. If the problem not solved, probably Rap fail, replace Rap if needed
6. Replacing Rap (using repair tool box) need flash firmware.
