Ninebot Max Error Code 35
"Vehicle Default Serial Number, Please replace the Control Board"
This error is caused by the ESC having the default serial number of N4GEA1601C0001.
This can happen for any number of reasons but usually happens when flashing a firmware file with the serial number included.
To fix it, change the serial number to a different one.
To do that, you can follow the guide at Ninebot Max Change Serial number.