i transformed my n70 no brand (but this is valid for branded too) to an N70 Music Edition with firmware 5.0638.3.0.1.
All u need is here and your flash will be made from NSU official Nokia.
* Install NSS. (attached in this post)
* Install NSU. (download from nokia site)
* Connect your telephone and wait until it finished to install the drivers.
* Open NSS and click on the icon in the right part
* Click on the icon "phone information"
* Click on "scan"
* Open gsm-magic and click enable (attached in this post)
* You will note that you can write on "product code" (on the right of the window "phone info" of NSS)
* Go in "flash" window and choose your phone, then in market you will find all the product code for your phone
*Just choose in "phone info" window in "product code" 0536418 (music edition code) click enable and then click on "write". Your product code will be changed.
Now open NSU and flash your n70 with music edition latest firmware!!

For downloading files i described, go here

[Only registered and activated users can see links]

Ps sorry for my bad english!
I had these info from [Only registered and activated users can see links]