Index: yc_ipc.c
===================================================================
--- /YC3121_SDK/fw/sdk/yc_ipc.c	(revision 602)
+++ /YC3121_SDK/fw/sdk/yc_ipc.c	(working copy)
@@ -143,6 +143,7 @@
 	{
 		ipc_inited = TRUE;
 		SYSCTRL_ROM_SWITCH = 0x94;
+		delay(10000);   //wait rom switch ok
 		BT_RESET = 1;
 		delay(10000);   //wait for reset ok
 		while(!(BT_CONFIG & (1 << BT_INIT_FLAG)));