diff --git a/payload/user/remote_access/pager-webui/server.py b/payload/user/remote_access/pager-webui/server.py
index a4978f4..6339ba8 100644
--- a/payload/user/remote_access/pager-webui/server.py
+++ b/payload/user/remote_access/pager-webui/server.py
@@ -1817,8 +1817,14 @@ def h_pineap_wifi_set_ap(ctx):
     open_band = channel_band(openap.get('channel')) if openap.get('channel') is not None else None
     use_radio1 = wpa_band in (BAND_5G, BAND_6G) or open_band in (BAND_5G, BAND_6G)
     if use_radio1:
-        wpa_active = bool(wpa.get('enabled', True)) and wpa.get('channel') is not None
-        open_active = bool(openap.get('enabled', True)) and openap.get('channel') is not None
+        wpa_active = (wpa_band in (BAND_5G, BAND_6G) and bool(wpa.get('enabled', True))
+                      and wpa.get('channel') is not None)
+        open_active = (open_band in (BAND_5G, BAND_6G) and bool(openap.get('enabled', True))
+                       and openap.get('channel') is not None)
+        wpa_present = bool(wpa.get('ssid') or wpa.get('enabled') is not None)
+        open_present = bool(openap.get('ssid') or openap.get('enabled') is not None)
+        if (wpa_present and wpa_band == BAND_2G) or (open_present and open_band == BAND_2G):
+            return 400, {'error': 'cannot configure 2.4GHz and radio1 APs in one request'}
         if not (wpa_active or open_active):
             _remove_radio1_ap()
             device_run(['wifi', 'reload'])
diff --git a/tests/test_pineap_bands.py b/tests/test_pineap_bands.py
index fb8b356..f9d24f0 100644
--- a/tests/test_pineap_bands.py
+++ b/tests/test_pineap_bands.py
@@ -249,6 +249,15 @@ class SetApRadio1Test(unittest.TestCase):
         self.assertEqual(self.uci['pineapd.wlan1mon.hop'], '1')
         self.assertEqual(self.uci.get('wireless.radio1.channel'), 'auto')
 
+    def test_mixed_24g_and_radio1_rejected(self):
+        status, payload = server.h_pineap_wifi_set_ap(ctx({
+            'open': {'ssid': 'CorpGuest', 'hidden': False, 'enabled': True,
+                     'channel': 36, 'country': 'US'},
+            'wpa': {'ssid': 'Office', 'passphrase': 'secret123', 'enctype': 'psk2',
+                    'hidden': False, 'enabled': True, 'channel': 6}}))
+        self.assertEqual(status, 400)
+        self.assertIn('2.4GHz', payload['error'])
+
 
 class GetApRadioChannelFallbackTest(unittest.TestCase):
     """Regression: iface without a channel option inherits the radio channel."""