This is a list of official Nokia Service points in Belgium.

All the addresses under the header "Brabant" are either in Brussels or in close proximity of Brussels. Maybe you can phone (one of) those shops and explain your problem to them and they'll most likely be able to help you.

If you want to know beforehand if they'll be able to help you, you could try and email them. The email addresses of the shops are also on the list I provided.

Good luck!