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Warning· MBB / BMS log file

Firmware Mismatch

Module firmware versions are incompatible

SystemSource: MBBLog file condition
Last updated: July 30, 2026

What it means

Module firmware versions are incompatible

WarningMonitor the situation, may self-resolve.

Likely causes

  • Partial firmware update
  • Module replacement without update

What to do

  1. 1Dealer firmware update required
  2. 2Bike may operate with reduced features

Which bikes use this table

Recorded in the binary log rather than shown on the dash — every generation writes them.

Questions

What does "Firmware Mismatch" mean in a Zero log?

Module firmware versions are incompatible. It is written by the MBB. It is classed as warning: monitor the situation, may self-resolve.

What should I do about it?

Dealer firmware update required. Bike may operate with reduced features.

See when this actually happened on your bike

A dash code tells you the fault; the log tells you the pack temperature, the state of charge and the ten minutes leading up to it.

Upload a log

Community reference: ZeroManual wiki entry

The code and its name are transcribed from Zero's own owner manuals; the severity, category and troubleshooting notes are ours. For official diagnostics, consult an authorized Zero Motorcycles dealer.