Ninebot ESX Error Code 27
"Control Board Password Error, Please replace the Control Board"
Ninebot Error code 27 is the same on both the Ninebot ESX/SNSC 1.0 and the Ninebot Max/SNSC 2.0.
If your Ninebot ESX(ES1, ES2, ES3, or ES4) or SNSC (1.0 or 1.1) 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.
Previous Error Code: Ninebot ESX Error Code 26 - Next Error Code: Ninebot ESX Error Code 28
Cause
This error occurs when ESC's are not properly STLinked or an incomplete firmware dump is used.
Fix
Temporary
To fix error 27, an easy temporary way is to simply press throttle and brake as soon as the vehicle is powered on.
This also acts as a sort of "lock" mechanism as failure to do this immediately after power-on results in a scooter that will continue beeping until it is turned off, though it is still able to be ridden.
Permanent
Change the ESC serial number twice using Ninebot IAP, Scooterhacking Utility, or some other application capable of changing the serial number or the "region".