Recovery of flash corrupted ePMP Force 300-13L/Force 300-25L caused due to power interruption during a software upgrade

Problem Statement:

ePMP Force 300-13L/Force 300-25L have a single flash bank. There is a high probability that the flash bank can get corrupted when power to the radio is interrupted during a flash write, i.e. software upgrade. This is not an issue with the Sync radio since there are two flash banks in them – one active and the other inactive. The inactive bank will take over if the active bank is corrupted.

Solution:

It is possible to recover an ePMP radio’s corrupted flash.

To perform the recovery procedure, the following is needed:

  1. ePMP Force 300-13L/Force 300-25L with corrupted flash, i.e. there was a power interruption during a software upgrade and the device is no longer accessible or boots up.
  2. Laptop or PC with a 3rd party TFTP server (ex: Free TFTP server for Windows )

Recovery Procedure:

  1. Connect the PC/Laptop to the ePMP radio.
  2. The PC/Laptop must be deployed in the same network as the ePMP device.
  3. TFTP Server IP address must be set to 192.168.1.10/255.255.255.0.
  4. Get the ePMP Force 300-13L/Force 300-25L recovery image from Cambium Support Center (openwrt-ar71xx-generic-uImage-initramfs-lzma.bin).
  5. Reboot the ePMP device.
  6. After successful boot-up, the ePMP radio will perform the recovery procedure. The procedure will take approximately 5 minutes. Once done, Force 300-13L/300-25L will reboot automatically.
  7. After boot-up, the radio will be accessible using default local IP of 192.168.0.2 or the fallback IP of 169.254.1.1.
  8. IMPORTANT: Software Upgrade through the GUI must be performed one more time for successful recovery in order to reflash broken image.

NOTE: This recovery procedure will work in cases where the u-boot of the radio is intact. In rare cases where the u-boot may also be corrupted, recovery is not possible.

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