Cannot use my SIM CARD into DWR-921 w/ OpenWrt Firmware, Pleease HELP!

Installing and Using OpenWrt Network and Wireless Configuration
1

Please some one help me , i wanna use my SIM Card.
my sim card have not PIN.

I haD EXECUTE:

uci set network.wwan=interface
uci set network.wwan.proto='qmi'
uci set network.wwan.device='/dev/cdc-wdm0'
uci set network.wwan.apn='wap.tim.it'
uci commit network
&
uci set firewall.@zone[1].network='wan wan6 wwan'
uci commit firewall

but into LOG show "Permission Denied"

and when i execute:

root@OpenWrt:~# uqmi -d /dev/cdc-wdm0 --get-data-status
"disconnected"
2

Type this and reboot

uci set network.wwan.autoconnect='1'
uci set network.wwan.delay='5'
uci commit network