If the Nokia Software Updater tool doesn't work for you, you can try using the Phoenix Service Software:
Since official Nokia support servers are no longer active, you must use legacy third-party tools to "flash" the firmware files manually: nokia+e71+rm346+latest+flash+file+install
Before you begin, make sure you have:
This is a timing issue. Disconnect battery, wait 30 seconds, reconnect battery, and start the flash process again. Also try a different USB port (USB 2.0 is more reliable than 3.0). If the Nokia Software Updater tool doesn't work