echo 0x30 > /sys/devices/platform/wlan-omap/default_country Now when I cat that file I get this output: Regulatory domain: 0x30 It does appear to show the required change (previous setting was 0x10).
However, in the thread you have linked, some posts ( > #15) suggest that changes to the /sys/..../default_country file will not make the desired change in the kernel.