My Note, that I got in May 2012, came with Gingerbread. Since then ICS and JB have been rolled out. My Note is locked to Digicel and probably tied to this region. I get no update when checking for OTA updates. The other option is to use Kies. However I've been running Windows 8 64 bit for a while now and only recently has Kies been made compatible. I downloaded and installed and got the following error "the ordinal 7170 could not be located in the dynamic link library". I did some digging around and found this error was related to the mfc90u.dll file and that I should replace the one in the Windows system folder with the one in the Kies folder. I read where these files belong to the (Visual) C/C++ runtime and/or MFC library. In the end I got the firmware upgrade to work. Some of the screens take a long while to appear so I had to be patient. Also don't touch, move or disconnect the phone during the upgrade process.
Please share with us your experience with the upgrade process in the comments below.