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In case the phone crashed and can't boot up successfully. Flash memory data destroyed. Then you can use the following procedure to install the latest firmware in the device.
To download the latest firmware, please go to our Product pages. Release Notes page

Using the reset button at the bottom of the device


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

User-added imageImage Removed 

Image Added

Waiting for upgrade


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-IP-address> PUT filename.


  • Open a Terminal
  • Firmware file has to be in users home-DIR
  • tftp
  • connect
  • binary
  • rexmt 1
  • timeout 60
  • put <filename.img>