This issue can be solved by Flashing the Nokia phone. But for that you will need proper firmware for Nokia 5230. And remember if you did this wrong your will not work until you carry it to Nokia Care. But flashing will wipe out everything from the phone. It is simply like re-installing the operating system of phone. Flashing is an tricky process which can be done by software and as well as by some special cables.
You have to download c6 V20.0.041 firmware which works with nokia 5230,5233,5235.
Second you will need Navifirm tool.
Third you will need The JAF tool with Pkey
Download the above stuff and run Navifirm. Before this you will need to install Nokia PC Suite. There are more process here but for this I will recommend you to go on Youtube and watch a proper video guide.
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