@Kai920: you've been doing remarkably well - your situation is rare as is your desire to be part of the solution. Also, the patience you have is amazing, which is good as I suspect it's about to be stretched even further...
Based on this thread and your subsequent posts it seems that, in addition to setting the region, you're also going to need to establish the (real C) retail dashboard and register for Live! Consequently, my recommendation is:
(!) make sure you have a good backup of at least your shadowC and eeprom.bin on your PC
(i) set your region (to 2) so you can cold-boot your NTSC-J MA
(ii) install a simple MA gamesave exploit (which wouldn't use C at all)
(iii) confirm that the MA exploit works!
(iv) ftp the current (real) C to your PC
... hmm, I think that's all the necessary prep! ...
(v) replace the (real) C content with the entire shadowC dashboard (PC backup)
(vi) reboot and check that the Live tab (online dashboard) works, letting it update if it needs to
(vii) cold-boot TopSpin, register for live and enjoy
... when enclined ...
(viii) cold-boot the MA exploit (and backup C to yor PC if live updated it)
(ix) re/install the/a UXE based exploit and confirm it works
(x) cold-boot TopSpin for live and confirm that it can still connect
Hopefully others will notice any mistakes I may have made and post accordingly eh...