ZyXEL zte zxdsl-531b ユーザーズマニュアル

Chapter 6:Troubleshooting

 

 63

If you get a failed ping with the response of: 

Request time out 

Then the DNS is not reachable. Check your DNS setting on the ADSL Router. 

The following lists the error messages that you may see during upgrading and the action to take. 

 

Error: All the ADSL LEDs light up and cannot light off as usual. 

Possible cause: When users execute firmware upgrade and save settings to the router, the power for the router is 
lost for some unknown reasons, the normal web page for the router might be damaged.(see the graphic below) 
After power on your router, the LEDs might not work normally. 

 

Action: Use the browser to connect to the router for executing image upgrade. 

 

Error Message: invalid checksum 

Possible cause: The firmware file to be used is damaged or the file format is wrong. 

Action: Make sure that your firmware file format is valid or get a new firmware file. 

 

Error Message: invalid hardcode 

Possible cause: The firmware file is not compatible with the model of your ADSL Router.   

Action: Download a compatible firmware from the web. 

 

Error Message: unknown flags type 

Possible cause: The firmware version is not compatible. 

Action: Download a compatible firmware from the web. 

 

Error Message: internal isfs error / internal flashfs error 

Possible cause: System error occurs. It may be caused by the lack of memory. 

Action: Reboot your ADSL Router and perform the upgrade task again. 

 

Error Message: invalid file format 

Possible cause: The firmware file format is invalid. 

Action: Check the file format is correct, otherwise download a firmware file with correct format. 

 

Error Message: get an error message 

Possible cause: The TFTP server responses with error message. 

Action: Make sure the file name you enter is correct. Otherwise the TFTP server may response with the error 
message “File not found”.