diff --git a/scripts/customize-wireless-regdb.py b/scripts/customize-wireless-regdb.py
index 01e11b6..71a2229 100644
--- a/scripts/customize-wireless-regdb.py
+++ b/scripts/customize-wireless-regdb.py
@@ -40,8 +40,6 @@ def transform(lines: list[str]) -> tuple[list[str], bool]:
     out = list(lines)
     if out and not out[-1].endswith("\n"):
         out[-1] = f"{out[-1]}\n"
-    if out and out[-1].strip():
-        out.append("\n")
     out.append("country BJ:\n")
     out.extend(f"{rule}\n" for rule in TEMPLATE_LINES)
     return out, True
@@ -58,7 +56,9 @@ def main() -> int:
     transformed, added = transform(original)
 
     rendered = "".join(transformed)
-    if "country BJ:\n" not in rendered or "    (5150 - 5350 @ 160), (36)\n" not in rendered or "    (5925 - 7125 @ 320), (36)\n" not in rendered:
+    if "country BJ:\n" not in rendered or (
+        added and any(f"{rule}\n" not in rendered for rule in TEMPLATE_LINES)
+    ):
         print("wireless-regdb customization failed: BJ template validation failed", file=sys.stderr)
         return 1
 
diff --git a/scripts/verify-custom-regdb.sh b/scripts/verify-custom-regdb.sh
index 71601fa..9b737fb 100644
--- a/scripts/verify-custom-regdb.sh
+++ b/scripts/verify-custom-regdb.sh
@@ -19,9 +19,33 @@ test -s "$REGDB" || fail "regulatory.db is absent from the root filesystem"
 test -n "$MANIFEST" || fail "firmware manifest was not found"
 
 extract_country() {
-  awk -v header="country $1:" '$0 == header { inside = 1 } inside { if ($0 ~ /^country [A-Z0-9][A-Z0-9]:/ && $0 != header) exit; print }' "$2"
+  awk -v country="$1" '
+    $0 ~ ("^country " country ":") { inside = 1 }
+    inside {
+      if ($0 ~ /^country [A-Z0-9][A-Z0-9]:/ && $0 !~ ("^country " country ":")) exit
+      print
+    }
+  ' "$2"
 }
 
+country_codes() {
+  awk '/^country [A-Z0-9][A-Z0-9]:/ { print substr($2, 1, 2) }' "$1"
+}
+
+stock_countries="$(country_codes "$STOCK_DB_TXT")"
+if grep -Fxq 'BJ' <<< "$stock_countries"; then
+  expected_countries="$stock_countries"
+else
+  expected_countries="${stock_countries}"$'\nBJ'
+fi
+custom_countries="$(country_codes "$DB_TXT")"
+diff -u <(printf '%s\n' "$expected_countries") <(printf '%s\n' "$custom_countries") >/dev/null || fail "country list was modified unexpectedly"
+
+while IFS= read -r country; do
+  test -n "$country" || continue
+  diff -u <(extract_country "$country" "$STOCK_DB_TXT") <(extract_country "$country" "$DB_TXT") >/dev/null || fail "country $country was modified"
+done <<< "$stock_countries"
+
 grep -qx 'country BJ:' "$DB_TXT" || fail "country BJ is absent"
 stock_world="$(extract_country 00 "$STOCK_DB_TXT")"
 custom_world="$(extract_country 00 "$DB_TXT")"