Headstock Handlebar Firmware Kit For Ninebot For Segway Kick Scooter Es1 Es2 Es3 Es4 Electric Scooter Parts Accessories - Scooter Parts & Accessories - AliExpress
Ninebot ES2 first firmware update! - e-Scooters - Electric Unicycle Forum (euc community)
custom firmware speed up to 35 km / h ( es2) - Scooter Talk
How to install Stock firmware on Ninebot-Segway ES1/ES2/ES3/ES4