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Press "Yes" to enter the Rescue mode. You will see the following text on the display:
 

Image AddedImage Removed

Waiting for upgrade

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Now you can install new software using TFTP . Your Computer should be in the same Network like the phone (192.168.15.x)

On Windows

• Open a "DOS-box"
• go to the DIR where the Firmware is located
• TFTP

  tftp -i

  PHONE

   <PHONE-IP-address> PUT filename.

  IMG

  img

On MAC

• Open a Terminal
• Firmware file has to be in users home-DIR

• tftp

• connect 192.168.15.1

• binary

• rexmt 1

• timeout 60

• put <filename.img>