Ninebot Max Error Code 51

The app is unsure what this error code means as it's usually a rental only error code.

Error 51 on a Ninebot Max.
"Controller and dashboard match failure"

If your Ninebot Max is beeping or has a red wrench icon and flashes this code, read below.

If you clicked the wrong error code, go back to the Error Code Index.

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Cause

This error is usually a firmware mismatch.

Make sure your scooter has firmware versions that work together, ex:

Old DRV and New BLE 
Rental and retail installed on different parts

These combos may cause this error.

Fix

Update all parts to "proper firmware".

Restart the scooter.