For flash your set you need below instrument and software ......
*Phone's usb data cable
*Phoenix Service software (download link: http://depositfiles.com/files/qiqbgfg2x )
*For your phone's useful flash file you can download this link(download link: http://www.symbian-toys.com/navifirm.aspx#download ) in this navifirm software search with your phone's RM number .
Now How can you start flash your phone set...
*After download this phoenix software instal in your pc C:/ drive
*After download with this Navifirm all file make with 1 folder then pest this folder in C:\Program Files\Nokia\Phoenix\Products\ please attention which folder you pest in here it should me same as your RM number (ex: RM-512)
*Now open phoenix software and connect your phone with your data cable with your pc.
*If Click on right side NO CONNECTION text then you can see your phone's RM number then select RM number
*Now click on Flashing and select on Firmware Update.
*Click on right site Box on Product Code and select your product and press OK
*Now click on Refurbish.
*Now flash your phone set with phoenix instruction.
Thank You