Replace memory card and check it again. If card is not formated make it formate with card settings from Nokia Asha 203 or formate the memmory card with computer.
After dis assambly of nokia asha 203 check the whole mother borad for water damages or carbon on it. If you find it clean mother board with electronics cleaner and apply hot air to make it dry.
Do not apply much heat it can damage the nokia sha 203 mother board or may can harm your skin also. Check red line Ic that is used for memory card function in Nokia Asha 203. Re sold it and re flow the IC. If resolding of the memory card IC can not solve MMC problem you have to replace thic MMC Ic in noki aasha 203.
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