Reverse engineering my e-scooter and rewriting the firmware in Rust

一句话概要

I reverse engineered the hardware and firmware of my Egret GT E-Scooter. I describe how I got in, analysed communication between components, and reverse engineered firmware. I speak about writing custom firmware for the display unit.

原文开头节选

Last year, I bought myself an Egret GT . It’s an e-scooter that touts a range of 100km and has very large tyres which makes driving it quite comfortable. To make sure you know that it’s a high-end e-scooter, it comes with a 320x480 LCD display used as a HUD, on which the speed, driving mode, battery level and range are displayed.

Now because I have to break tinker with everything I own, I eventually decided to start figuring out how this thing worked. I can’t remember exactly why, but it was possibly due to the fact that holding the ‘down’ button on the keypad while powering the scooter would cause it to enter a firmware update mode. If you clicked a button to exit this menu, you would enter the normal ‘driving’ mode, and would be able to use the scooter without entering the PIN. While I always secure the scooter with a reasonably good lock, this still irked me a bit.

The first thing I started on was the mobile app, which allows you to unlock the scooter remotely, change a few settings, and view the battery level.

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