Firmware update on branded Nokia E61

A wise advice I always liked is "if it ain't broke, don't fix it", however when talking about my gadgets I prefer to use: "Do as I say, not as I do".
An example of this is my mobile, a new Nokia E61. I bought it from Vodafone Ireland for a reasonable price plus 10 Euro in free calls for eight months, which made the offer more attractive.
As soon as I started to play with the E61, checked the firmware version on it and, to my delight, it was not the lastest one, so once again the opportunity to enjoy a firmware upgrade.
Nokia provides for some of his most recent models, a utility you can download from their site, install on your PC and update the firmware on your mobile from the comfort of your own home by downloading the new code from the internet and transferring it via the USB port to the device.
After installing and launching the Nokia Updater, followed all the steps in order to get the new firmware, but to my surprise I only received a discouraging message telling me that there were no updates available for my phone. It didn't make any sense as the new firmware was officially released!
Doing some research I found out that the update was not available for some branded phones and this was confirmed by other users who had Nokia branded phones from different providers around the world.
After a few days and lots of sites I finally found a blog from someone who had the problem issue and succeeded in forcing a firmware update. Happy days!!
The trick basically consists in changing the Product Code on your mobile to one for which updates are available (I used code 0530151 on my mobile).
I successfully flashed my Nokia E61 to the newest firmware version by following those instructions. The phone was working fine before, but now I fixed it!!.