I used the Riff box from fonefunshop.com (http://www.fonefunshop.co.uk/Unlocking/riff_box.htm) worked a treat. It does take some fiddling, even with a jig. Sometimes the points don't sit right on the JTAG points.
Another thing to keep an eye on is the wiring between the box and the JTAG ports, with my jig I used a ribbon cable which had to be the right way round for the connections to work.
Dependant on what error you was getting, or at what point it was failing, will filter out what the cause could be.
Keep me posted on how you get on .
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