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TS-450i/TS-550i Phone Locked (Screen is blank)
Last Updated: 01/13/2012
If you are having an issue with a TS-450i/TS-550i that the phone has locked up or the
screen is blank but there is power, a phone lock-up may be caused by a communications error during a
firmware upgrade. To correct this problem:

1. Disconnect power from the phone.
2. Press and hold the volume up and 2 button while re-applying power.
3. Release the buttons when the Message LED in the top corner turns off.
4. When the BootC screen appears, enter the digits 1, 2, 3, 4.
5. Follow the prompts to configure IP parameters for the phone.
6. At the Server Addr? prompt, enter the TFTP server address where the
phone can find the firmware files. If already correct, press the Next
softkey.
7. At the Do you want to apply default? prompt, select the Yes softkey to
use defaults or No softkey to use previously assigned parameters.
The phone will reboot, perform the update and return to normal
operation.

For more information on Troubleshooting, open the TS-450i and TS-550i User Guide-1 below and refer to the troubleshooting section on page 70 (76 of 82 in the .pdf)

Attachments:   09/01/2011: TS-450i and TS-550i User Guide-1.pdf


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