diff --git a/devices/t21_lite_chinamobile-hdc-51-a5-v12/general/overlay/usr/share/openipc/customizer.sh b/devices/t21_lite_chinamobile-hdc-51-a5-v12/general/overlay/usr/share/openipc/customizer.sh
index 31568c2..31ee0e3 100644
--- a/devices/t21_lite_chinamobile-hdc-51-a5-v12/general/overlay/usr/share/openipc/customizer.sh
+++ b/devices/t21_lite_chinamobile-hdc-51-a5-v12/general/overlay/usr/share/openipc/customizer.sh
@@ -29,6 +29,7 @@ cli -s .audio.srate 48000
 fw_setenv wlandev rtl8189fs-generic
 #fw_setenv wlanssid Router
 #fw_setenv wlanpass 12345678
+fw_setenv extras nogmac
 #
 #
 # Set osmem and rmem