Debranding the Nokia E63

has anyone done this? Is there a guide for this? Please post step-by-steps or a link or something because I really want to debrand. Can't use custom themes and such, says something about a bad certificate.
Answer :
google nemesis (nss) for debranding (changing product code)
but i suspect you mean to hack so you do not receive certificate errors, this i would not advise without a lot of thought.but if you trust applications that you are going to install then get each signed seperately.again google