diff --git a/data-src/index.js b/data-src/index.js
index 3b6326e..f3e548d 100644
--- a/data-src/index.js
+++ b/data-src/index.js
@@ -418,6 +418,9 @@ function sendEdit(name, fields, target, cb) {
 // A command's repeat count, when the caller gave one.
 function repeatOf(repeat) { return typeof repeat === 'number' ? repeat : undefined; }
 function gone(what) { ui.errorMessage(`The ${what} is no longer there.`); }
+// The chip model the header sent: '' for the original ESP32, then s3, p4es
+// and so on.
+function chipModel() { return document.getElementById('divContainer').getAttribute('data-chipmodel') || ''; }
 // The lists redraw from the model after events, a burst of them at once.
 // While the socket is down they wait for the next sync.
 var renderPending = {};
@@ -1601,7 +1604,7 @@ class Wifi {
         this.onETHBoardTypeChanged(document.getElementById('selETHBoardType'));
         this.initialized = true;
     }
-    isP4() { return (document.getElementById('divContainer').getAttribute('data-chipmodel') || '').startsWith('p4'); }
+    isP4() { return chipModel().startsWith('p4'); }
     clockModes() { return this.isP4() ? this.ethClockModesP4 : this.ethClockModes; }
     // The board presets, clock modes and pins of the chip: the ESP32's or the
     // P4's.  The chip comes with the sync, after init().
@@ -1976,8 +1979,7 @@ class Somfy {
     // Warns of radio pins that can stop the board booting (issue #34).
     checkBootPins() {
         let trans = ui.fromElement(document.getElementById('divTransceiverSettings')).transceiver;
-        let chip = document.getElementById('divContainer').getAttribute('data-chipmodel') || '';
-        let warnings = BootPins.radioWarnings(chip, trans.config);
+        let warnings = BootPins.radioWarnings(chipModel(), trans.config);
         let div = document.getElementById('divRadioBootPins');
         div.innerText = warnings.join('\n');
         div.style.display = warnings.length > 0 ? '' : 'none';
@@ -2753,7 +2755,7 @@ class Somfy {
 
     loadPins(type, sel, opt) {
         while (sel.firstChild) sel.removeChild(sel.firstChild);
-        let cm = document.getElementById('divContainer').getAttribute('data-chipmodel');
+        let cm = chipModel();
         // The pre-v3 P4 build has the same pins.
         if (cm === 'p4es') cm = 'p4';
         let pm = this.pinMaps.find(x => x.name === cm) || { name: '', maxPins: 39, inputs: [], outputs: [] };
@@ -4200,7 +4202,7 @@ class Firmware {
         div.style.display = '';
     }
     updateFirmware() {
-        let chip = document.getElementById('divContainer').getAttribute('data-chipmodel') || '';
+        let chip = chipModel();
         // Firmware from before the field leaves it out: undefined, not false.
         if (proto.model.header.hasOtaSlot === false) {
             ui.infoMessage(`This device has no OTA slot, so its firmware is flashed over USB with SomfyController.onboard.esp32${chip}.bin, from the release's SomfyController.onboard.esp32${chip}.bin.zip. That image holds the web UI and an empty configuration too, so take a backup first and restore it afterwards.`);
@@ -4223,7 +4225,7 @@ class Firmware {
         let div = this.createFileUploader('/updateApplication');
         general.reloadApp = true;
         let inst = div.querySelector('div[id=divInstText]');
-        let chip = document.getElementById('divContainer').getAttribute('data-chipmodel') || '';
+        let chip = chipModel();
         inst.innerHTML = `<div style="font-size:14px;">Select a binary file [SomfyController.littlefs.esp32${chip}.bin] containing the littlefs data for the application then press the Upload File button.</div>`;
         if (this.isMobile()) {
             inst.innerHTML += `<div style="width:100%;color:red;text-align:center;font-weight:bold;"><span style="margin-top:7px;width:100%;background:yellow;padding:3px;display:inline-block;border-radius:5px;background:white;">WARNING<span></div>`;
diff --git a/data-src/js/pins.js b/data-src/js/pins.js
index c1c55fe..145ce0c 100644
--- a/data-src/js/pins.js
+++ b/data-src/js/pins.js
@@ -1,6 +1,8 @@
 // The strapping pins whose level at reset can keep each chip from starting
 // the firmware, as src/BootPins.h has them for the log.  A radio that drives
 // one at power-up stops the board booting until EN is pressed (issue #34).
+// Keep the pins, the radio pins checked and the shared RX/TX rule in step
+// with that file.
 // The minify step joins this file into index.js; Node loads it on its own for
 // the tests (test/js).
 class BootPins {
@@ -9,7 +11,7 @@ class BootPins {
     static radioWarnings(chipModel, config) {
         const chip = BootPins.CHIPS[chipModel || ''] || {};
         const warnings = [];
-        for (const [field, name] of BootPins.RADIO) {
+        for (const [field, name] of BootPins.RADIO_PINS) {
             const pin = config[field];
             if (field === 'RXPin' && pin === config.TXPin) continue;
             const effect = chip[pin];
@@ -32,5 +34,5 @@ BootPins.CHIPS = {
 // The radio pins the CC1101 drives at power-up, before it is set up: GDO0
 // puts out a clock, GDO2 CHIP_RDYn, and SO follows CHIP_RDYn while CSN is
 // low.
-BootPins.RADIO = [['TXPin', 'TX'], ['RXPin', 'RX'], ['MISOPin', 'MISO']];
+BootPins.RADIO_PINS = [['TXPin', 'TX'], ['RXPin', 'RX'], ['MISOPin', 'MISO']];
 if (typeof module !== 'undefined' && module.exports) module.exports = { BootPins };
diff --git a/src/BootPins.h b/src/BootPins.h
index b02004f..0809623 100644
--- a/src/BootPins.h
+++ b/src/BootPins.h
@@ -9,7 +9,9 @@
 // the firmware.  The ROM reads them before any code runs, so a radio that
 // drives one at power-up stops the board booting until EN is pressed (issue
 // #34).  The strapping pins that only pick a download mode, quiet the boot
-// log or set the SDIO timing aren't listed.  web UI: data-src/js/pins.js.
+// log or set the SDIO timing aren't listed.  The web UI has the same pins in
+// data-src/js/pins.js, and checks the same radio pins as
+// transceiver_config_t::apply(): keep the three in step.
 //
 // Returns what the pin does at reset, or nullptr for a pin that can't stop
 // the boot.
diff --git a/src/ConfigRecords.h b/src/ConfigRecords.h
index 54c6b73..582e14f 100644
--- a/src/ConfigRecords.h
+++ b/src/ConfigRecords.h
@@ -183,7 +183,7 @@ struct trans_record_t {
   uint8_t MOSIPin = 23;
   uint8_t MISOPin = 19;
   uint8_t TXPin = 13;
-  uint8_t RXPin = 12;
+  uint8_t RXPin = 35;
   float frequency = 433.42;
   float rxBandwidth = 99.97;
   float deviation = 47.60;
diff --git a/src/Transceiver.cpp b/src/Transceiver.cpp
index b5d671e..74967ac 100644
--- a/src/Transceiver.cpp
+++ b/src/Transceiver.cpp
@@ -605,7 +605,7 @@ void transceiver_config_t::apply() {
       ESP_LOGD(TAG, "Applying radio settings - Setting Data Pins RX:%u TX:%u", this->RXPin, this->TXPin);
       // The pins the CC1101 drives at power-up, before it is set up: GDO0
       // puts out a clock, GDO2 CHIP_RDYn, and SO follows CHIP_RDYn while CSN
-      // is low.
+      // is low.  The web UI checks the same (data-src/js/pins.js).
       warnBootPin("TX", this->TXPin);
       if(this->RXPin != this->TXPin) warnBootPin("RX", this->RXPin);
       warnBootPin("MISO", this->MISOPin);
diff --git a/test/js/pins.test.js b/test/js/pins.test.js
index 2c80d15..cd0a391 100644
--- a/test/js/pins.test.js
+++ b/test/js/pins.test.js
@@ -38,7 +38,7 @@ test('MISO and TX warn, the pins the radio only reads do not', () => {
 });
 
 test('the pre-v3 P4 has the P4 pins', () => {
-    assert.deepEqual(BootPins.radioWarnings('p4es', { SCKPin: 27, CSNPin: 46, MOSIPin: 32, MISOPin: 33, TXPin: 2, RXPin: 35 }),
-        BootPins.radioWarnings('p4', { SCKPin: 27, CSNPin: 46, MOSIPin: 32, MISOPin: 33, TXPin: 2, RXPin: 35 }));
-    assert.equal(BootPins.radioWarnings('p4', { SCKPin: 27, CSNPin: 46, MOSIPin: 32, MISOPin: 33, TXPin: 2, RXPin: 35 }).length, 1);
+    const p4 = { SCKPin: 27, CSNPin: 46, MOSIPin: 32, MISOPin: 33, TXPin: 2, RXPin: 35 };
+    assert.equal(BootPins.radioWarnings('p4', p4).length, 1);
+    assert.deepEqual(BootPins.radioWarnings('p4es', p4), BootPins.radioWarnings('p4', p4));
 });