Limited country list in config wireless controller setting

In order to set the correct country code, your hardware will have to correspond to your part of the world as well.

FAPs are denoted, for example, "FAP-223E-X" where X is the region-specific SKU suffix.

X=A, B, D, E; F; I; J, K, N, P, S, T, V, Y where

A

ARGENTINA
ARUBA
BAHAMAS
CANADA
GUAM
HAITI
AMERICAN_SAMOA
BERMUDA
CAYMAN_ISLANDS
DOMINICA
MARSHELL ISLANDS
NICARAGUA
NORTHERN_MARIANA_ISLA
PALAU
ST_KITTS_NEVIS
ST_LUCIA
ST_VINCENT_GRENADIENS
VIRGIN_ISLANDS
PUERTO_RICO
UNITED STATES

E

AUSTRIA
BELGIUM
BOSNIA & HERZEGOVINA
BULGARIA
CENTRAL AFRICA
CROATIA
CYPRUS
CZECH REPUBLIC
DENMARK
ESTONIA
FINLAND
FRANCE
GERMANY
GREECE
GREENLAND
HUNGARY
ICELAND
IRAQ
IRELAND
ITALY
LATVIA
LEBANON
LIECHTENSTEIN
LITHUANIA
LUXEMBOURG
MACEDONIA
MALTA
MYANMAR
NETHERLANDS
NETHERLANDS_ANTILLES
NORWAY
POLAND
PORTUGAL
ROMANIA
SAUDIA ARABIA
SERBIA & MONTENEGRO
SLOVENIA
SOUTH AFRICA
SPAIN
SWEDEN
SWITZERLAND
TURKEY
UNITED ARAB EMIRATES
UNITED_KINGDOM
BELARUS
KENYA
MOZAMBIQUE
ANGOLA
MAURITANIA
ALBANIA
TANZANIA
ZIMBABWE
CONGO, DEMOCRATIC REPUBLIC OF THE
CONGO, REPUBLIC OF THE
COTE_D_IVOIRE (Ivory Coast)
OMAN
SLOVAKIA
AZERBAIJAN
GEORGIA
MONACO
TUNISIA
AFGHANISTAN
BENIN
BHUTAN
BOTSWANA
BURKINA_FASO
CAMEROON
CHAD
ETHIOPIA
FAEROE_ISLANDS
FRENCH_GUIANA
FRENCH_POLYNESIA
GHANA
GIBRALTAR
GUADELOUPE
LESOTHO
LIBYA
MADAGASCAR
MALI
ISLE OF MAN
MARTINIQUE
MAURITIUS
MAYOTTE
MOLDOVA
MONTENEGRO
NAMIBIA
NIGER
REUNION
RWANDA
ST_BARTHELEMY
ST_MARTIN
ST_PIERRE_MIQUELON
SIERRA LEONE
SURINAME
TOGO
TURKS_CAICOS
UGANDA
WALLIS_FUTUNA
YEMEN
ZAMBIA

I

ALGERIA
ARMENIA
BAHRAIN
BRUNEI DARUSSALAM
ISRAEL
JORDAN
KUWAIT
MOROCCO
MALDIVES
SENEGAL
QATAR
TURKMENISTAN
UZBEKISTAN

J

JAPAN

K

KOREA_REPUBLIC

N

AUSTRALIA
BARBADOS
BELIZE
BOLIVIA
BRAZIL
CHILE
COLOMBIA
COSTA RICA
DOMINICAN REPUBLIC
GRENADA
GUATEMALA
ECUADOR
EL SALVADOR
FIJI
HONDURAS
HONG KONG
JAMAICA
MEXICO
NEW_ZEALAND
PANAMA
PAPUA NEW GUINEA
PARAGUAY
PERU
TRINIDAD & TOBAGO
URUGUAY
CHRISTMAS_ISLAND
GUYANA
MALAWI
MICRONESIA
VANUATU
VENEZUELA

V

SRI LANKA
CAMBODIA
LAOS
THAILAND

S

PHILIPPINES
SINGAPORE
MACAU
MALAYSIA
VIETNAM

T TAIWAN
U UKRAINE

P

RUSSIA
KAZAKHSTAN

F INDONESIA
C CHINA
D INDIA
Y EGYPT

B

BANGLADESH
NEPAL
PAKISTAN

As there are different frequencies across the world which are available (for free) for WiFi, the hardware has to be adapted for different regions.

My guess is that depending on the hardware SKU suffix, you can only choose from a limited range of country IDs.