Originally Posted by DeMar27
... installed some script that I found on forum
Hmm... What script do you mean?
Anyway, to enable last (14) channel for .11g, without the script,
you need to set "wifi_country_code=JP" in the "secure" table in the following database:
(It may be easily done with RootExplorer and SQLite editor installed).
Also, it may help for 5GHz .11n too, by default (for USA) very few channels are available,
Most channels in .11n become active with EU code in the field above.
And, there is no need to reboot the phone after change - just switch WiFi off/on!