What if mobile thieves can not reset mobile?
The thief is able to reset and unlock whatever you do. However, keep all the security systems in the phone (Screen Lock, Google account, MI / Samsung Account / Huawei ID, etc.) turned on.
However, you will not get the phone back.
If you contact the nearest police station to get the phone quickly, they will take necessary action. And for this the police will need a phone packet for your phone's IMEI number.
You can also note down the IMEI number separately.