OK, this is sort of related...
I go Le Pan TC970 connected on Ch 12!
Base on http://forum.xda-developers.com/show....php?t=1067944
I manually modified the settings.db and it sort of worked (Ch 12 only, and no go on Ch 13 for some reasons....)
Copy /data/data/com.android.providers.settings/databases/settings.db to sdcard
Modify settings.db using SQLite "Manager" by adding extra row 116, wifi_country_code, EU in "secure" table
Rename /data/data/com.android.providers.settings/databases/settings.db to /data/data/com.android.providers.settings/databases/settings.db.bk just in case
copy the newly modified settings.db from sdcard back to /data/data/com.android.providers.settings/databases folder
Update: WiFi Analyzer can see my AP when set to Ch13 too. But it can't connect, and I think maybe is my router....