airFiber - How to reset with TFTP firmware recovery


If you already tried resetting your device to factory default values with the reset button and you can't access the unit, you can perform a reset using TFTP Recovery.

By reloading fresh firmware to restore the device, this process can also be useful to recover devices that have appeared to fail when no other solution is working.

Note: The firmware used is dependent on 1) the firmware compatible with the product, and, 2) the version (use the latest available in most cases).



  • airFiber device to upgrade
  • A narrow tool to press down reset button (like the pin of a headset or paper clip)
  • An Ethernet cable
  • TFTP client running on PC
  • Latest AirOS F firmware file (you can download it from

NOTE: airFiber 5/5U and airFiber24 use different firmware versions, so make sure you have the right one for your device.

This guide refers to a PC running Windows, but is easly applicable to any other OS.


  • Do not switch off, do not reboot and do not disconnect the device from the power supply during the firmware upgrade process, as these actions will damage the device!

Recovery procedure (applies to all AirFiber device)

Windows Users

  1. First, power off the device
  2. Configure your computer: Windows PC's Ethernet must be configured manually with the following settings (under Network Connections):
    IP Address:, Subnet Mask :
  3. Connect your AF unit to the PC using the Config port. Note: DATA port doesn't work for TFTP recovery method
  4. Begin by pressing the reset button. Keep holding, then power the unit on. Wait 8 seconds then release the button (if you want to reset the unit to factory defaults, wait at least 15 seconds). Signal LEDs will be lit indicating that the device is ready for recovery
  5. Make sure that radio responds to pings (perform a ping from a DOS window), if it does not, go back to the first step

  6. Upload firmware image file .bin to, using a TFTP client software (binary mode). Windows integrated command line TFTP client or download a third party utility to upload the AirOS firmware. Below are two examples:
    1. Windows Alternative 1: From Windows PC, you can use TFTP command line from a DOS window (START>>>CMD): 

      Go into the same directory structure as the firmware (e.g., assuming that you have stored the image files in c:\firmware directory, type the command :cd c:\firmware) and enter the following (for help type TFTP -h) , e.g.:

      tftp -i put XS2.ar2316.v3.4-rc.4351.090504.2146.bin

    2. Windows Alternative 2: Download and execute tftp2 and configure it as in the image to upgrade. 
  7. Signal LEDs will keep blinking one by one in 4 different colors during firmware upgrade. Wait for about 7-10 minutes (devices and firmware depending) - do not power off the device during the procedure!


Linux Users

Generic Linux distributions have an integrated command line TFTP client. From a PC running Linux, you can upload via TFTP by typing into Terminal the following commands:

tftpput XS2.ar2316.v3.4-rc.4351.090504.2146.bin
Sent 1965199 bytes in 35.2 seconds