The DRV321_BLE157_BMS141 update was rolled out on March 21, 2022. If you have already installed this on your scooter, then the scooter BLE must be downgraded with a programmer (ST Link v2) so that you can use modified firmware. This is no longer possible via Bluetooth (as of today)".
BLE downgrade using STLINK V2:    • Xiaomi scooter 1S BLE157 downgrade us...  
Workaround for BLE157:    • Xiaomi Scooter 1S BLE157 speed unlocked  

20220508 New controllers ver 3.1 appeared, If you flash this ESC with old (3.0 controller) firmware, then this leads to the BRICK. For ESC3.1, you need the new generation DRV: https://nextgenfw.pythonanywhere.com/
How to flash bricked ESC:    • Flashing Xiaomi electric scooter ESC ...  

You need to check your microcontroller version, for that use "Scooter hacking utility"
STM32F ver. 3.0
GD32Ever. 3.1
GD32Fver 3.3

20221206 "Scooter hacking utility" SHFW now supports Xiaomi GD32 models. ESC3.1 ESC3.3
it will automatically detect your controller and choose the right firmware (shfw)

1. Hacking a scooter firmware can cause hardware damage while flashing or later in exploitation time.
2. You will lose the warranty.
3. Check your country's laws for the maximum allowed speed.
4. Use S mode only in private terrain.
5. This is just an example of how I flashed my scooter, I'm not suggesting you do that.
6. If you decide to do that, it's at your own risk.

Scooter hacking utility SHFW (for STM32FGD32EGD32F ESC3.0ESC3.1ESC3.3) https://play.google.com/store/apps/de...
Firmware download site DRV (only for STM32F ESC3.0): https://www.monopattinoitalia.it/migl...
App for flashing: https://play.google.com/store/apps/de...

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