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Update your N73 to Generic

Here’s a tutorial that will teach you how to update your phone’s
firmware to a Nokia original version
(without your operator’s personalization) with NSU
(Nokia Software Update – the official Nokia program).

NSU reads the product code of your phone and it searches its database
for a newer version of the corresponding firmware in order to upgrade it.
This is why you will need to change the product code of your phone into a
non-branded product code, before running NSU.

Download the « NSS » software in order to change the phone’s product code.
This is a shareware program that you can download on the site of its author here :
http://www.b-phreaks.co.uk/software.htm
And finally, download NSU here: NSU.
http://www.nokia.co.uk/A4254291

NOW WE CAN BEGIN:
Install NSS (Install as a Virtual USB)
Install NSU
Connect your phone and wait for Windows to install the drivers.
Open NSS and click on “Scan for new device” on the right-upper part of the window
Click on the icon « Phone info »
Click on “Scan”
Now you can change the product code (on the right of the « phone info »
window of NSS). For a Nokia N73, type the product code 0541479
(this is the product code for Three UK Standard N73, still tryimg to find the Music Edition product code!) and then mark the case “Enable”.
Now press “Write”, and your phone’s product code will be changed
(you might think that nothing happened, because the phone is still in normal mode,
and the changing of the product code only takes a couple of seconds, but don’t worry,
the product code changed !).
Close NSS and you can proceed now with the NSU flashing.
When the flashing with NSU is over, start-up your phone and you’ll have the pleasant
surprise that your phone’s firmware is the latest Nokia firmware to date!

NOTE: I was advised to disable any antivirus and firewall on your PC during the flashing,but didn't effect me with them being on.