There might be problem with your firmware version of the device.
Do a hard reset of your device, hopefully it will be solved. Here is the instruction:
Suggested From:
Samsung Galaxy S6500 Unlock Code Sim Network Pin
Performing a Factory Reset on Samsung Galaxy S6500:
1. Hold both the volume up key and the power key at a time to start the phone.
2. Command to Factory reset /wipe data>>>delete all user data>>>reboot system now
3. HARD RESET COMPLETE.
How to Hard (Master) Reset?
1. Select "Menu">>> "Settings."
2. Go to "Privacy">>>"Factory Data Reset".
3. "Format USB Storage" CONFIRM TO CLEAR DEVICE..
4. "Reset phone.">>>"Erase Everything" confirm to reset to factory settings.
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