diff --git a/CMakeLists.txt b/CMakeLists.txt
index 5b888db..93c9ab8 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -56,7 +56,10 @@ target_include_directories(wdl_resampler PUBLIC
 
 target_compile_options(wdl_resampler PRIVATE -fsigned-char)
 target_compile_options(ds5-bridge PRIVATE -fsigned-char)
-target_compile_definitions(ds5-bridge PRIVATE CYW43_LWIP=0)
+target_compile_definitions(ds5-bridge PRIVATE
+        CYW43_LWIP=0
+        PICO_FLASH_ASSUME_CORE1_SAFE=1
+)
 
 pico_set_program_name(ds5-bridge "ds5-bridge")
 pico_set_program_version(ds5-bridge "0.1")
diff --git a/src/audio.cpp b/src/audio.cpp
index 42d7249..ee042a2 100644
--- a/src/audio.cpp
+++ b/src/audio.cpp
@@ -22,7 +22,7 @@ void audio_loop() {
     // 1. 读取 USB 音频数据
     if (!tud_audio_available()) return;
 
-    int16_t raw[1024];
+    int16_t raw[1024]; // 48000 / 3000 = 16, 64 * 16 = 1024
     uint32_t bytes_read = tud_audio_read(raw, sizeof(raw));
     int frames = bytes_read / (INPUT_CHANNELS * sizeof(int16_t));
     if (frames == 0){
diff --git a/src/bt.cpp b/src/bt.cpp
index 0d48f6f..7dffdcb 100644
--- a/src/bt.cpp
+++ b/src/bt.cpp
@@ -16,7 +16,7 @@
 #include "pico/cyw43_arch.h"
 #include "pico/stdio.h"
 #include "utils.h"
-#include "pico/multicore.h"
+#include "bsp/board_api.h"
 #include "pico/sync.h"
 #include "classic/sdp_server.h"
 
@@ -238,9 +238,7 @@ static void hci_packet_handler(uint8_t packet_type, uint16_t channel, uint8_t *p
             printf("[HCI] Authentication complete handle=0x%04X status=0x%02X\n", handle, status);
             if (status != ERROR_CODE_SUCCESS) {
                 printf("[HCI] Authentication failed, drop stored key for %s\n", bd_addr_to_str(current_device_addr));
-                multicore_lockout_start_blocking();
                 gap_drop_link_key_for_bd_addr(current_device_addr);
-                multicore_lockout_end_blocking();
                 // gap_inquiry_start(30);
             } else {
                 hci_send_cmd(&hci_set_connection_encryption, handle, 1);