One way is to spoof the firmware, but WUP installer doesn't work correctly with 5.5.2 downloaded from NUS (results in "not a valid game" error). Until we can properly spoof firmware, not much can be done atm.
Maybe it's already fixed, because I didn't read all the new threads.
Is it still an issue ?
Which WUP installer did you use?
Getting the latest "version.bin" title from your correct region, and installing it with WUP should be enough to spoof the version.
Another solution is to use CBHC which spoof to v99
edit:
It's not an issue, he used the wrong WUP installer.
PS : I stickied this thread in the
Tutorial section, it's important to know current/old guides are outdated and potentially dangerous until they integrate the new v5.5.2
best protection for now is the DNS filtering option.