Hello
Please follow the instructions on the link below if you have access to computer.
http://satechhelp.co.za/2326/Dowload-Nokia-Phone-Firmware-Navifirm-Plus-3-2-Tech-Tips
You can also use phoenix software, see here http://satechhelp.co.za/2326/Dowload-Nokia-Phone-Firmware-Navifirm-Plus-3-2-Tech-Tips