diff --git a/pre_build.py b/pre_build.py
index e87fadf..70783d7 100644
--- a/pre_build.py
+++ b/pre_build.py
@@ -185,13 +185,16 @@ def patch_nimble_device():
         content = f.read()
 
     # v1.4.3 code has ESP_ERROR_CHECK(esp_bt_controller_init(&bt_cfg));
+    # Arduino framework inits controller but does NOT enable it.
+    # We must enable even if init returns INVALID_STATE (already init'd).
     old_block = (
         'ESP_ERROR_CHECK(esp_bt_controller_init(&bt_cfg));\n'
         '        ESP_ERROR_CHECK(esp_bt_controller_enable(ESP_BT_MODE_BLE));\n'
         '        ESP_ERROR_CHECK(esp_nimble_hci_init());'
     )
     new_block = (
-        'if (esp_bt_controller_init(&bt_cfg) == ESP_OK) {\n'
+        'esp_err_t __bt_err = esp_bt_controller_init(&bt_cfg);\n'
+        '        if (__bt_err == ESP_OK || __bt_err == ESP_ERR_INVALID_STATE) {\n'
         '            ESP_ERROR_CHECK(esp_bt_controller_enable(ESP_BT_MODE_BLE));\n'
         '        }\n'
         '        ESP_ERROR_CHECK(esp_nimble_hci_init());'