Many people seem to have problem with n73 unlock but I think easiest way is to take your time, this one is more hard than 6280 but still not that hard. I always unlock this one with just ***** eye no microscope, think that is easiest way for this one.
Some easy Steps
1. Take your time - be careful this model.
2. Count pins, make small mark on rap chip to indicate where to touch TPs.
3. Make some kind of adapter, many here posted methods, personally I use one of copper wire from old nonworking hwk cable(sure many of us got ome of those lying around

) by ripping out one wire then inside there are many small strands of wire, take one of thís wrap around both tp cables.
4. Get something t o hold board steady in place where you can see.
5. Unlock - works 100000%