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Cisco SPA 50xG in S.O.S Recovery Mode

When firmware is not successfully updated on a Cisco 50xG phone, the phone could enter into a unusable state called S.O.S Recovery mode, this usually occurs when power is lost during a firmware upgrade.

The Cisco SPA 50xG phone will automatically try to fix itself by attempting to download firmware from the "last upgrade URL"

However, if this fails you can recover the phone manually by following these steps:

  • 1. Download the Cisco Recovery Tool here
  • 2. If you currently have a TFTP server installed on your PC, please make sure that this is inactive and that the TFTP port (69) is not occupied
  • 3. You may have to disable your firewall in order to allow communication between your phone and PC
  • 4. Once you have downloaded and unzipped the Cisco SPA 50xG Recovery Tool, run spa5x5-7-4-4-recovery.exe then enter the serial number of your phone (if you do not know the serial number of your phone, you can use "FFFFFFFFFFFF"
  • 5. The Cisco SPA 50xG Recovery Tool should begin searching for the phone in recovery mode, once found, follow the on screen instructions to recover  your phone
  • 6. Now you will be able to upgrade the Cisco SPA 50xG phone to the desired firmware
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