I am trying to convert a 3310 (v.5.03) into a 3315. So i know i have to flash at least v5.57 into the 3310 first, but every time i get Contact Service.

I have tried searching for the answer on this forum and there are a few posts, but i am still unclear as to the real answer - people have suggested lots of things like correcting checksums, not using wintesla files etc.

I would like to know WHY it isnt working, not just how to make it work. Surely rolis (4.7 should be able to flash the most popular nokia model?!? Maybe i am doing something wrong?

Could someone also explain how to tell between a wintesla file and a dejan file.


Any help much appreciated