Cambium Networks ePMP Firmware Recovery via TFTP

Repairing Cambium Networks ePMP device firmware via TFTP.

Description of the problem:
All devices of the ePMP line, with the exception of Connectorized AP with GPS synchronization, have one memory section for storing firmware. The probability of damage to this section is high enough during power outages during operation, and especially flashing. This does not apply to devices with GPS synchronization, since they use two sections of memory, the so-called active bank and inactive bank. In case of damage to the firmware in the active bank, the device starts using the firmware from the inactive bank.

Decision:
Starting with version 2.6.2, for all ePMP devices with one memory partition, it is now possible to restore firmware using an external TFTP server. Recovery cannot be performed on devices with firmware below 2.6.2.

What is needed to restore the firmware:
1. ePMP (non GPS) device with damaged firmware. Symptoms - the web does not load, it is not accessible by ssh on default IP addresses.
2. Firmware no lower than 2.6.2 must be installed on the device.
3. PC with installed TFTP server (ex: tftpd32.jounin.net )

Recovery procedure:
1. On the network with the device on which you want to restore the firmware, other third-party TFTP servers should not be used.
2. TFTP server designed to restore the firmware must have the IP address 192.168.1.10/255.255.255.0.
3. The firmware file must be extracted from tar.gz and placed in the root folder of the TFTP server.
4. The firmware file must have a name: firmware.bin
5. Use only one ePMP device at a time. Multiple devices cannot be restored at the same time.
6. After restoring the firmware, the device will be available at the last saved or default IP address.
7. The flashing of the device should be carried out again immediately after successful recovery via TFTP.