I tried changing the product code on my 6120c to get a different language pack, and when nsu finished and the phone went to restart, it gave me the error message: "Phone start-up failed. Contact retailer." I didn't know what to do.
Then luckily I found that if u press "3" "*" and the green send buttons while powering phone on it will start up. I did that and phone was not working well but had the changed language pack so I changed product code back to the original and ran nsu again and phone is fine after I loaded back up files.
Did I do something wrong? I followed the directions at this link: http://thenokiablog.com/2007/05/12/how-to-update-firmware-debranding-andor-change-language-pack-on-the-nokia-n95/
and changed the product code to: 0546344 (Balkans)
Can somebody please help...