diff --git a/keyboards/splitkb/halcyon/kyria/keymaps/default/keymap.c b/keyboards/splitkb/halcyon/kyria/keymaps/default/keymap.c
index 60ecf539db5..3db3ac3087d 100755
--- a/keyboards/splitkb/halcyon/kyria/keymaps/default/keymap.c
+++ b/keyboards/splitkb/halcyon/kyria/keymaps/default/keymap.c
@@ -203,26 +203,4 @@ const uint16_t PROGMEM keymaps[][MATRIX_ROWS][MATRIX_COLS] = {
 //                                  _______, _______, _______, _______, _______, _______, _______, _______, _______, _______
 //     ),
 //
-};
-
-#ifdef ENCODER_ENABLE
-bool encoder_update_user(uint8_t index, bool clockwise) {
-
-    if (index == 0) {
-        // Volume control
-        if (clockwise) {
-            tap_code(KC_VOLU);
-        } else {
-            tap_code(KC_VOLD);
-        }
-    } else if (index == 1) {
-        // Page up/Page down
-        if (clockwise) {
-            tap_code(KC_PGDN);
-        } else {
-            tap_code(KC_PGUP);
-        }
-    }
-    return false;
-}
-#endif
+};
\ No newline at end of file
diff --git a/keyboards/splitkb/halcyon/kyria/rev4/keyboard.json b/keyboards/splitkb/halcyon/kyria/rev4/keyboard.json
index 1d7f1ea9e04..34e5f0041bd 100755
--- a/keyboards/splitkb/halcyon/kyria/rev4/keyboard.json
+++ b/keyboards/splitkb/halcyon/kyria/rev4/keyboard.json
@@ -1,9 +1,6 @@
 {
     "keyboard_name": "Halcyon Kyria rev4",
     "bootloader": "rp2040",
-    "build": {
-        "lto": true
-    },
     "diode_direction": "COL2ROW",
     "encoder": {
         "enabled": true,
@@ -156,8 +153,9 @@
             "driver": "vendor"
         },
         "transport": {
-            "watchdog": true,
-            "watchdog_timeout": 3000
+            "sync": {
+                "matrix_state": true
+            }
         }
     },
     "usb": {
diff --git a/keyboards/splitkb/halcyon/kyria/rev4/rev4.c b/keyboards/splitkb/halcyon/kyria/rev4/rev4.c
new file mode 100644
index 00000000000..90840ae834f
--- /dev/null
+++ b/keyboards/splitkb/halcyon/kyria/rev4/rev4.c
@@ -0,0 +1,26 @@
+// Copyright 2024 splitkb.com (support@splitkb.com)
+// SPDX-License-Identifier: GPL-2.0-or-later
+
+#include QMK_KEYBOARD_H
+
+#ifdef ENCODER_ENABLE
+bool encoder_update_kb(uint8_t index, bool clockwise) {
+
+    if (index == 0) {
+        // Volume control
+        if (clockwise) {
+            tap_code(KC_VOLU);
+        } else {
+            tap_code(KC_VOLD);
+        }
+    } else if (index == 1) {
+        // Page up/Page down
+        if (clockwise) {
+            tap_code(KC_PGDN);
+        } else {
+            tap_code(KC_PGUP);
+        }
+    }
+    return false;
+}
+#endif