# Then use the '''lsusb''' command to see the device information of the rtl8821cu usb wifi module. Make , please make sure that the USB module is not in the Driver CDROM Mode

<big>'''If the USB WIFI module seen by the lsusb command is in Driver CDROM Mode, re -insert please unplug the USB WiFi WIFI moduleagain. If not, please manually execute the following command to switch to the next mode: '''</big>

<li>The Linux system will automatically load the RTL8821CU Bluetooth rtl8821cu bluetooth and WIFI wifi-related kernel modules. You , through the lsmod command, you can see that the following kernel module below is modules have been automatically loaded through the lsmod command</li>

<li>You Through the dmesg command, you can see the loading information of the rtl8821cu module through the dmesg command</li>

<li>Then you can see the RTL8821CU WiFi device node through the '''sudo ifconfig''' command. Please refer to the [[Orange Pi 3B#WIFI connection test|'''WiFi connection testchapter''']] a section for WIFI connection and testing methods.</li>

<li>Bluetooth icons can also be seen on the desktop. At this time, Bluetooth has not been openedturned on, so a red '''<span style="color:#FF0000">x</span>''' will be displayed</li>

<li>Click '''Turn Bluetooth On''' to open turn on Bluetooth</li>

<li>The display after opening turning on Bluetooth is shown belowas follows</li>

<li>Please refer to the [[Orange Pi 3B#How to use Bluetooth|'''Bluetooth use chapter''']] for the Bluetooth test method. I won't go into details herhere</li></ol>