6600... cable? box? which?

[c_martini]

I would like to flash upgrade my 6600 and also unlock/debrand it. I have seen conflicting reports as to how this is done, including the DCT4 flashing thread in this forum. There was one person who mentioned they were able to do it with a cable, but did not provide proof of this. My Sony Ericsson t610 was easy. I just purchased a lpt dongle/usb cable and used software to unlock it and flash upgrade it.
The 6600 seems to be a more complicated matter.

Do I definately need a box to do it?

Can I get away with a cable & software? If so, which one?

If I need the box, obviously this is too expensive a proposition to just flash one phone.
In that case, how would I approach a Nokia service center to do all of this for me?
Is there anyone in London that owns one of these magic boxes that can do it for me inexpensively?

Any help or advice would be much appreciated