Hi, I bought N8, and when I inserted my SIM card it asked for a code of which I inserted the one provided to me, however I got a message code error, and despite this the phone continued to work. The owner said it was giving the same message but works. I updated the software to Belle and now whenever I turn it on it says system error always and when I press OK the message disappears. How can I resolve this? Any help will be appreciated.
You can try these steps but first thing you need to back up your files.
Hope this helps.