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1# Fixing Image Burning Errors
2
3
4## "Error: Opening COMxx: Access denied" is displayed when I start image burning
5
6- **Symptom**
7
8  "Error: Opening COMxx: Access denied" is displayed after a serial port is selected to start image burning.
9
10    **Figure 1** Failed to open the serial port
11
12   ![hi3516-faq-serial-access-denied](figures/hi3516-faq-serial-access-denied.png)
13
14- **Possible Causes**
15
16  The serial port is in use.
17
18- **Solution**
19
201. Search for the terminal using serial-xx from the drop-down list in the **TERMINAL** panel.
21
22    **Figure 2** Checking whether the serial port is in use
23
24   ![hi3516-faq-serial-check](figures/hi3516-faq-serial-check.png)
25
262. Click the dustbin icon as shown below to disable the terminal using the serial port.
27
28    **Figure 3** Disabling the terminal using the serial port
29
30   ![hi3516-faq-serial-close-terminal](figures/hi3516-faq-serial-close-terminal.png)
31
323. Click **Burn**, select the serial port, and start burning images again.
33
34    **Figure 4** Restarting the burning task
35
36   ![hi3516-faq-serial-reburn](figures/hi3516-faq-serial-reburn.png)
37
38
39## The development board failed to connect to the PC
40
41- **Symptom**
42
43  The file image cannot be obtained after a serial port is selected to start image burning.
44
45    **Figure 5** Failed to obtain the file image due to network disconnection
46
47   ![hi3516-faq-network-fail](figures/hi3516-faq-network-fail.png)
48
49- **Possible Causes**
50
51  The development board is disconnected from the PC.
52
53  Windows Firewall does not allow Visual Studio Code to access the network.
54
55- **Solution**
56
571. Check whether the network cable is properly connected.
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592. Click **Windows Firewall**.
60
61    **Figure 6** Network and firewall settings
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63   ![hi3516-faq-firewall-setting](figures/hi3516-faq-firewall-setting.png)
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653. Click **Firewall & network protection**, and on the displayed page, click **Allow applications to communicate through Windows Firewall**.
66
67    **Figure 7** Firewall and network protection
68
69   ![hi3516-faq-firewall-setting-allow](figures/hi3516-faq-firewall-setting-allow.png)
70
714. Select Visual Studio Code.
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73    **Figure 8** Selecting Visual Studio Code
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75   ![hi3516-faq-firewall-find-vscode](figures/hi3516-faq-firewall-find-vscode.png)
76
775. Select the **Private** and **Public** network access rights for Visual Studio Code.
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79   **Figure 9** Allowing Visual Studio Code to access the network
80
81   ![hi3516-faq-firewall-vscode-allow-network](figures/hi3516-faq-firewall-vscode-allow-network.png)
82
83
84## (Hi3516) No information is displayed through the serial port
85
86- **Symptom**
87
88  The serial port shows that the connection has been established. However, no information is displayed through the serial port after the board is restarted and **Enter** is pressed.
89
90- **Possible Cause 1**
91
92  The serial port is connected incorrectly.
93
94- **Solution**
95
96  Change the serial port number.
97
98  Start **Device Manager** to check whether the serial port connected to the board is the same as that connected to the terminal device. If the serial ports are different, correct the serial port number by following instructions in ["Error: Opening COMxx: Access denied" is displayed when I start image burning](#error-opening-comxx-access-denied-is-displayed-when-i-start-image-burning).
99
100- **Possible Cause 2**
101
102  The U-Boot of the board is damaged.
103
104- **Solution**
105
106  Burn the U-Boot.
107
108  If the fault persists after you perform the preceding operations, the U-Boot of the board may be damaged. You can burn the U-Boot by performing the following steps:
109
1101. Obtain the U-Boot file.
111   > ![icon-notice.gif](public_sys-resources/icon-notice.gif) **NOTICE**
112   >
113   > You can download the U-Boot file from the [open-source package](device\hisilicon\hispark_taurus\sdk_liteos\uboot\out\boot\u-boot-hi3516dv300.bin).
114
1152. Burn the U-Boot file.
116
117   Follow the instructions in [Burning Through the USB Port](https://device.harmonyos.com/en/docs/documentation/guide/upload_hi3516_small_system-0000001326267405).
118
1193. Log in to the serial port after the burning is complete.
120
121    **Figure 10** Information displayed through the serial port after the U-Boot is burnt
122
123   ![hi3516-faq-burn-uboot-success](figures/hi3516-faq-burn-uboot-success.png)
124