Exchanging chip in V7

[fratres]

Hey Sped,
thanks a lot for your detailed info, now everything´s answered. To be honest I already hoped you might interfere and give some definite answers, just didn´t dare to PM you and bother you with my newbie-probs.

Saving the money and getting a pro to do it is possibly the best option, but somehow I kinda licked blood.

And as Duo2 obviously doesn´t need any change on the mb (it´s 5V, isn´t it, as lufcfan once asked?) and as TO (CC) and 3V3 don´t look difficult either, it´s only Y (MI) and W that might cause problems. They are already covered with tin AFAIK, so maybe I should give it a try (CC to avoid Y?).