Ninebot ESX Error Code 35
"Default vehicle S/N, please replace master control. (35)"
Cause
This error is caused by the ESC having the default serial number of N2GEA1601C0001.
This can happen for any number of reasons but usually happens when flashing a firmware file with the serial number included.
Fix
To fix it, change the serial number to a different one.
To do that, you can follow the guide at Ninebot ESX Change Serial number.