diff --git a/editor.html b/editor.html
index bd21466..32e02f6 100644
--- a/editor.html
+++ b/editor.html
@@ -1201,9 +1201,14 @@ function _queryDeviceVersion() {   // ask the device its firmware version (SysEx
   return new Promise((res) => { _verCb = res; _send([0xF0, 0x7D, 0x02, 0xF7]); setTimeout(() => { if (_verCb) { _verCb = null; res(null); } }, 1500); });
 }
 async function updateFirmware() {   // A/B firmware update over USB-MIDI: push the precompiled .mpy
-  if (!(await _ensureMidi()) || !_midiOutputs().length)
+  console.log("[fw] update start");
+  if (!(await _ensureMidi()) || !_midiOutputs().length) {
+    console.log("[fw] no MIDI output (outputs:", _midiOutputs().length, ")");
     return alert("Connect the PM_K-1 (Chrome/Edge/Firefox), then try again.");
+  }
+  console.log("[fw] MIDI ok; outputs:", _midiOutputs().map((o) => o.name));
   const dev = await _queryDeviceVersion();
+  console.log("[fw] device version reply:", dev);
   let latest = null, b64 = null;
   // version comes from the (text) source; the payload is the precompiled .mpy bytecode — CircuitPython
   // compiles a big .py at boot, which OOMs the RP2040, so we ship + push compiled bytecode instead.
@@ -1220,11 +1225,17 @@ async function updateFirmware() {   // A/B firmware update over USB-MIDI: push t
     b64 = _b64(u8); if (!latest) latest = "(picked .mpy)";
   }
   if (!latest) latest = "?";
+  console.log("[fw] latest:", latest, "| .mpy base64 length:", b64 && b64.length);
   const upToDate = dev && dev === latest;
   if (!confirm("Device firmware: " + (dev || "unknown") + "\nNew build: " + latest +
       (upToDate ? "\n\nSame version. Re-install anyway?"
-                : "\n\nUpdate now? The device reboots, runs the new build, and auto-rolls-back if it fails to start."))) return;
+                : "\n\nUpdate now? The device reboots, runs the new build, and auto-rolls-back if it fails to start."))) {
+    console.log("[fw] confirm returned false (cancelled, OR the browser is suppressing dialogs -> reload the page)");
+    return;
+  }
+  console.log("[fw] pushing", b64.length, "base64 chars...");
   const err = await _pushFirmware(b64);
+  console.log("[fw] push result:", err || "OK");
   if (err) return alert("Update didn't complete (" + err + ").\n\nThe device kept its working firmware — nothing was installed. " +
       "Make sure it's plugged in and NOT in editor mode (don't hold A), then retry.");
   alert("Update sent ✓ — the device verified v" + latest + " and is rebooting into it. It auto-confirms after a few seconds, or rolls back if it won't start.");