Ninebot ESX Error Code 49
"Built-in battery firmware is outdated. Please update to the latest version."
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.
Error 49 is thrown when the ESC has updated firmware but the BMS is on a version < 1.3.0.
Download a newer BMS firmware version by updating it in the app or manually and flash to both the internal and external battery.