diff --git a/components/bt/host/bluedroid/stack/include/stack/l2c_api.h b/components/bt/host/bluedroid/stack/include/stack/l2c_api.h
index 58d2a13797..76ec2b11c3 100644
--- a/components/bt/host/bluedroid/stack/include/stack/l2c_api.h
+++ b/components/bt/host/bluedroid/stack/include/stack/l2c_api.h
@@ -39,6 +39,7 @@
 ** HCI type(1), len(2), handle(2), L2CAP len(2) and CID(2) => 9
 */
 #define L2CAP_MIN_OFFSET    13     /* plus control(2), SDU length(2) */
+#define L2CAP_FCS_LEN       2      /* FCS 0 or 2 bytes */
 
 /* Minimum offset for broadcast needs another two bytes for the PSM */
 #define L2CAP_BCST_MIN_OFFSET       11
diff --git a/components/bt/host/bluedroid/stack/l2cap/l2c_utils.c b/components/bt/host/bluedroid/stack/l2cap/l2c_utils.c
index 059abe7be1..ea887b036e 100644
--- a/components/bt/host/bluedroid/stack/l2cap/l2c_utils.c
+++ b/components/bt/host/bluedroid/stack/l2cap/l2c_utils.c
@@ -1559,7 +1559,7 @@ tL2C_CCB *l2cu_allocate_ccb (tL2C_LCB *p_lcb, UINT16 cid)
     l2c_fcr_free_timer (p_ccb);
 #endif  ///CLASSIC_BT_INCLUDED == TRUE
     p_ccb->ertm_info.preferred_mode  = L2CAP_FCR_BASIC_MODE;        /* Default mode for channel is basic mode */
-    p_ccb->ertm_info.allowed_modes   = L2CAP_FCR_CHAN_OPT_BASIC|L2CAP_FCR_CHAN_OPT_BASIC;
+    p_ccb->ertm_info.allowed_modes   = L2CAP_FCR_CHAN_OPT_BASIC|L2CAP_FCR_CHAN_OPT_ERTM;
     p_ccb->ertm_info.fcr_rx_buf_size = L2CAP_FCR_RX_BUF_SIZE;
     p_ccb->ertm_info.fcr_tx_buf_size = L2CAP_FCR_TX_BUF_SIZE;
     p_ccb->ertm_info.user_rx_buf_size = L2CAP_USER_RX_BUF_SIZE;
diff --git a/components/bt/host/bluedroid/stack/rfcomm/port_api.c b/components/bt/host/bluedroid/stack/rfcomm/port_api.c
index 99d469c96b..4e1baf52a0 100644
--- a/components/bt/host/bluedroid/stack/rfcomm/port_api.c
+++ b/components/bt/host/bluedroid/stack/rfcomm/port_api.c
@@ -1552,7 +1552,8 @@ int PORT_WriteDataCO (UINT16 handle, int *p_len, int len, UINT8 *p_data)
             length = (UINT16)available;
         }
 
-        UINT16 alloc_size = (UINT16)(sizeof(BT_HDR) + L2CAP_MIN_OFFSET + RFCOMM_DATA_OVERHEAD+length);
+        UINT16 alloc_size = (UINT16)(sizeof(BT_HDR) + L2CAP_MIN_OFFSET + RFCOMM_DATA_OVERHEAD
+                                + length + L2CAP_FCS_LEN);
         p_buf = (BT_HDR *)osi_malloc(alloc_size);
         if (!p_buf) {
             RFCOMM_TRACE_EVENT ("PORT_WriteDataCO: out of heap.");