I am being honest. According to Quattro Formaggi Samsung Mobile Firmware Downloader (access to Samsung server),
the JA5 version I'd uploaded was the latest for Singapore.
It contained JA2 CSC file that come with all Singapore network operators profile and the same Chinese Display/Inputs too, that make it at least a little bit different from secany JA5 which only come with multiple European language CSC, with nothing for Singapore network operators.
For upgrade with Samsung New PC Studio case, I'm not sure as I've never use it to upgrade my Omnia2.
Below the screenshot for Samsung Mobile Firmware Downloader.
How can you connect to the fus server??? when i try to connect, keep prompt out " locked by administrator"