In first steps check the mother board if it have some rsust carbon or water damages. And may it have some missing or burn parts. So clean the mother board with electronics clean and apply heat to make it dry.
Check the Antina points and apply jumper as shown in first step of the above diagram.Re sold the main network Aplifier and reflow it as given in step 2 of the above diagram to solve newtwork and signals problem of Nokia X2-00.
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