diff --git a/Apps/BookPlayer/main/Source/main.c b/Apps/BookPlayer/main/Source/main.c
index 4f32b94..47133e4 100644
--- a/Apps/BookPlayer/main/Source/main.c
+++ b/Apps/BookPlayer/main/Source/main.c
@@ -125,14 +125,22 @@ static void play_wav(AppCtx* ctx);
 static void scan_books(AppCtx* ctx);
 
 /* ─── Audio-stream helpers ─── */
+// The flashed firmware exports the legacy device_find_* lookup API; the newer
+// device_get_* (out-param) API is not yet exported on 0.8.0-dev, so calling it
+// fails at load with "missing symbol". The newer SDK headers dropped the legacy
+// declarations, so declare them here (symbols are resolved at runtime by the ELF
+// loader against the flashed firmware).
+extern struct Device* device_find_by_name(const char* name);
+extern struct Device* device_find_first_by_type(const struct DeviceType* type);
+
 static bool find_audio_stream_device(AppCtx* ctx) {
-    struct Device* dev = NULL;
-    if (device_get_by_name("audio-stream", &dev) == ERROR_NONE && dev) {
+    struct Device* dev = device_find_by_name("audio-stream");
+    if (dev) {
         ctx->stream_dev = dev;
         return true;
     }
-    dev = NULL;
-    if (device_get_first_by_type(&AUDIO_STREAM_TYPE, &dev) == ERROR_NONE && dev) {
+    dev = device_find_first_by_type(&AUDIO_STREAM_TYPE);
+    if (dev) {
         ctx->stream_dev = dev;
         return true;
     }