Kindly refer on this link to update your phone's software with the latest version:
Ovi Suite is compatible with your device. Please see link below for more information:
Please select your device before downloading.
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When I tried to upgrade my C1-01 to the latest software, the backup worked fine, and the upgrade want on for a few minutes. I was asked by the phone to enter my code, which I did. AFter a few more minutes I got the message that the upgrade could not be completed, and now my phone is dead. I cannot start it and the computer will not recognize it. In short, it's unusable. What to do?
Sorry..but being an S40 device you can only try removing the battery for a couple of minuts, insert and see if the phone switches ON. Else, need to visit Nokia Care