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"Error 7 updating firmware--cannot start bootloader" when attempting to upgrade firmware in a MNB-1000


When attempting to upgrade the firmware in an MNB-1000, this error appears:

"Error 7 updating firmware--cannot start bootloader".

It appears like the MNB-1000 is running for a short period and then resetting.

Product Line

TAC IA Series


I/A Series MNB 1000


On occasion, activity on the MSTP trunk will cause this error.


  1. Access the MNB-1000 and disable the MSTP trunk.
  2. Attempt to upgrade the Plant controller again.
    Note: Use an IP connection to the MNB-1000 for the upgrade.
  3. Re-enable the MSTP trunk once the upgrade is complete.
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