STLink Ninebot Max Gen 2 ESC
In the case of a bricked ESC/Controller/Control Board, STLinking can save the controller from needing to be replaced in some instances.
For this process, you will need:
- Windows computer
- STLink (Decent quality clones will work)
- Tools to disassemble the scooter and access the parts
- Dupont male/female jumper cables
This process can be dangerous if done incorrectly so take caution when performing these steps and make sure you use a computer you are comfortable possibly destroying.
If you short a battery line you could end up blowing up your STLink, Computer, and more or even causing a fire.
For the Ninebot ESX Series/SNSC 1.0, use the guide at: STLink Ninebot ESX ESC.
Identify Which ESC Generation You Have
Check out the difference between the Ninebot Max ESC Generations and use the steps below depending on which one you have.
A Gen 1 ESC has bullet connectors and a silver metallic housing. Newer units may have writing as shown in this image. 
A Gen 2 ESC has screw terminals and a black plastic housing.
Accessing the Debug Pins
Accessing the ESC
Start by removing the 18 Security Torx T-15 screws on the bottom.
Using an M4 Allen/Hex wrench or bit, remove the two screws holding the ESC in place.
Carefully unplug each of the connectors.
You may need to scrape more rubber potting compound away from some of the connectors in order to unplug them.
Accessing The Pins
Remove the black shell from the ESC, and take the outer clips off first in order to slide the shell out from under the upper lip.
Software
Download STM32 STLink Utility from the ST website.
Scroll down and click "Get Software" and enter your email to receive a download link.
Install it and open it.
Flashing
Testing
Remove the STLink and plug back in the ESC and use ScooterHacking Utility to check that your version number is now 1.2.6.