diff --git a/Makefile b/Makefile
index 1fe5f26..ae6eae7 100755
--- a/Makefile
+++ b/Makefile
@@ -172,6 +172,10 @@ CONFIG_DRVEXT_MODULE = n
 export TopDIR ?= $(shell pwd)
 
 ########### COMMON  #################################
+ifeq ($(CONFIG_DISABLE_REGD_C), y)
+EXTRA_CFLAGS += -DCONFIG_DISABLE_REGD_C
+endif
+
 ifeq ($(CONFIG_GSPI_HCI), y)
 HCI_NAME = gspi
 endif
diff --git a/dkms.conf b/dkms.conf
index df0846a..5c3322b 100644
--- a/dkms.conf
+++ b/dkms.conf
@@ -1,5 +1,5 @@
 PACKAGE_NAME="realtek-rtl88xxau"
-PACKAGE_VERSION="5.2.20.2~20180829"
+PACKAGE_VERSION="5.2.20.2~20180812"
 CLEAN="'make' clean"
 BUILT_MODULE_NAME[0]=88XXau
 PROCS_NUM=`nproc`
diff --git a/os_dep/linux/ioctl_cfg80211.c b/os_dep/linux/ioctl_cfg80211.c
index 7701150..2145892 100644
--- a/os_dep/linux/ioctl_cfg80211.c
+++ b/os_dep/linux/ioctl_cfg80211.c
@@ -8880,12 +8880,12 @@ static void rtw_cfg80211_init_ht_capab_ex(_adapter *padapter
 
 			case RF_2T2R:
 			case RF_1T2R:
-				ht_cap->cap |= IEEE80211_HT_CAP_RX_STBC_1R;/* Only one spatial-stream STBC RX is supported */
+				ht_cap->cap |= IEEE80211_HT_CAP_RX_STBC_2R;/* Only one spatial-stream STBC RX is supported */
 				break;
 			case RF_3T3R:
 			case RF_3T4R:
 			case RF_4T4R:
-				ht_cap->cap |= IEEE80211_HT_CAP_RX_STBC_1R;/* Only one spatial-stream STBC RX is supported */
+				ht_cap->cap |= IEEE80211_HT_CAP_RX_STBC_3R;/* Only one spatial-stream STBC RX is supported */
 				break;
 			default:
 				RTW_INFO("[warning] rf_type %d is not expected\n", rf_type);
diff --git a/os_dep/linux/os_intfs.c b/os_dep/linux/os_intfs.c
index 7dc6ab5..3ac8635 100644
--- a/os_dep/linux/os_intfs.c
+++ b/os_dep/linux/os_intfs.c
@@ -174,7 +174,7 @@ int rtw_bw_mode = CONFIG_RTW_CUSTOMIZE_BWMODE;
 int rtw_bw_mode = 0x21;
 #endif
 int rtw_ampdu_enable = 1;/* for enable tx_ampdu , */ /* 0: disable, 0x1:enable */
-int rtw_rx_stbc = 1;/* 0: disable, bit(0):enable 2.4g, bit(1):enable 5g, default is set to enable 2.4GHZ for IOT issue with bufflao's AP at 5GHZ */
+int rtw_rx_stbc = 3;/* 0: disable, bit(0):enable 2.4g, bit(1):enable 5g, default is set to enable 2.4GHZ for IOT issue with bufflao's AP at 5GHZ */
 #if (defined(CONFIG_RTL8814A) || defined(CONFIG_RTL8822B)) && defined(CONFIG_PCI_HCI)
 int rtw_rx_ampdu_amsdu = 2;/* 0: disabled, 1:enabled, 2:auto . There is an IOT issu with DLINK DIR-629 when the flag turn on */
 #else
diff --git a/os_dep/linux/wifi_regd.c b/os_dep/linux/wifi_regd.c
index c710b25..e1751ce 100644
--- a/os_dep/linux/wifi_regd.c
+++ b/os_dep/linux/wifi_regd.c
@@ -529,6 +529,7 @@ static struct country_code_to_enum_rd *_rtw_regd_find_country(u16 countrycode)
 
 int rtw_regd_init(_adapter *padapter)
 {
+#ifndef CONFIG_DISABLE_REGD_C
 	struct wiphy *wiphy = padapter->rtw_wdev->wiphy;
 
 #if 0
@@ -547,7 +548,7 @@ int rtw_regd_init(_adapter *padapter)
 #endif
 
 	_rtw_regd_init_wiphy(NULL, wiphy);
-
+#endif
 	return 0;
 }
 #endif /* CONFIG_IOCTL_CFG80211 */