1. grab the datasheet
2. locate the following signal pins:
- nTRST (Test Rest
- TDI (Test Data Input)
- TDO (Tet Data Output)
- TMS (Test Mode Select)
- TCK (Test Clock)
4. find those on the circuit board
5. heat your oven 
6. get the chip off the board
my first try wasn’t too successful
so here we go again
7. now trace the previously identified pins
8. mission accomplished:
9. Resources
10. Notes
I think it is possible to do this without killing the device (which in my case didn’t matter because I got an already dead one just for this task).
Therefore you should prebake the circuit board at around 100°C for some time (to get the rid of the moisture) and only use the minimal temperature to unsolder the parts you want to remove/replace.
Also it might be a good idea to fixate the board so you dont accidentially move components once the solder is liquid (like I did – of course ).
Don’t hesitate to contact me in case you need some more traces, or parts of this board (though I can’t guarantee nothing)