Hi! Thank you guys for helping me.

The commands didn't show any positive result. What I did:

1. Pluged in the usb cable. As root I put: blacklist acm in /etc/modprobe.d/acm_driver.conf and /etc/modprobe.d/blacklist.conf

2. In terminal: modprobe pl2303 (It shows no error message)

3. I found new_id file in the directory: /sys/bus/usb-serial/drivers/pl2303/new_id

4. In terminal: echo 04cc 0000 > /sys/bus/usb-serial/drivers/pl2303/new_id

5. I checked the VID and PID is written in the new_id file. (Things gone right!)

6. In terminal:
bao@bao-desktop:~$ lsusb
Bus 001 Device 005: ID 1c4f:0026 SiGma Micro Keyboard
Bus 001 Device 004: ID 09da:c10a A4Tech Co., Ltd.
Bus 001 Device 007: ID 04cc:0000 ST-Ericsson
Bus 001 Device 003: ID 0424:ec00 Standard Microsystems Corp. SMSC9512/9514 Fast Ethernet Adapter
Bus 001 Device 002: ID 0424:9514 Standard Microsystems Corp. SMC9514 Hub
Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub

7. Terminal:
bao@bao-desktop:~$ dmesg | tail -n 20
[ 728.051600] pl2303 ttyUSB0: pl2303_set_line_request - failed: -71
[ 728.051771] pl2303 ttyUSB0: pl2303_set_control_lines - failed: -71
[ 728.051941] pl2303 1-1.2:1.0: pl2303_vendor_write - failed to write [0000]: -71
[ 737.999606] pl2303 ttyUSB0: pl2303_get_line_request - failed: -71
[ 737.999843] pl2303 ttyUSB0: pl2303_set_line_request - failed: -71
[ 738.000016] pl2303 1-1.2:1.0: pl2303_vendor_write - failed to write [0000]: -71
[ 738.253778] pl2303 ttyUSB0: pl2303_set_control_lines - failed: -71
[ 738.253928] pl2303 ttyUSB0: error sending break = -71
[ 738.255226] pl2303 ttyUSB0: pl2303_get_line_request - failed: -71
[ 738.255333] pl2303 ttyUSB0: pl2303_set_line_request - failed: -71
[ 738.255433] pl2303 1-1.2:1.0: pl2303_vendor_write - failed to write [0000]: -71
[ 738.255635] pl2303 ttyUSB0: pl2303_set_control_lines - failed: -71
[ 738.256272] pl2303 ttyUSB0: pl2303_get_line_request - failed: -71
[ 738.257479] pl2303 ttyUSB0: pl2303_set_line_request - failed: -71
[ 738.257665] pl2303 1-1.2:1.0: pl2303_vendor_write - failed to write [0000]: -71
[ 744.999874] pl2303 ttyUSB0: pl2303_get_line_request - failed: -71
[ 745.000100] pl2303 ttyUSB0: pl2303_set_line_request - failed: -71
[ 745.000285] pl2303 1-1.2:1.0: pl2303_vendor_write - failed to write [0000]: -71
[ 745.253391] pl2303 ttyUSB0: pl2303_set_control_lines - failed: -71
[ 745.253552] pl2303 ttyUSB0: error sending break = -71

8. What is the wrong!?
9. Plugged out and plugged in the cable. no result!

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