Why you need firmware and what risks it carries
Xiaomi firmware M365 Pro 2 is not just a software update, it's a complete rewriting of the firmware controller. Removing factory speed limits (usually 25 km/h instead of 20 km/h), improving accelerator responsiveness, optimizing power consumption or restoring performance after failures. However, improper firmware can lead to a complete lock of the controller, requiring soldering of the chip β this is a key risk, which is often ignored in simplified guides.
Xiaomiβs standard firmware is often criticized for artificial restrictions, especially in European versions of scooters. M365 Pro 2 with factory software speed is limited to 20 km / h, although the hardware allows you to accelerate to 30+ km/h Alternative firmware (e.g, CFW The community does not have these restrictions, but they require that you follow the instructions exactly, and it's important to understand that any firmware other than the official firmware gives you no warranty, even if the procedure is successful.
Another nuance: firmware affects not only the speed, but also:
- π Power saving mode β some firmware aggressively discharges the battery when downtime
- π‘οΈ Overheating protection β unofficial versions can ignore critical temperatures
- π The logic of regenerative braking - in cheap firmware, it works less smoothly.
- π‘ Compatibility with the application β after the firmware may disappear communication with Mi Home
β οΈ Warning: If your scooter is warranty-free, any firmware (even official) can cause a service failure.In 2023, Xiaomi tightened controls on modified controllers, which are determined by error logs.
What tools and files will be needed
For Xiaomi's firmware M365 Pro 2, you're going to need not only a firmware file, but also specialized hardware, and without the right tools, you can end up with a brick, which is what slang calls a completely inoperable device:
| Component | Appointment | Where to buy/download | Estimated price (2026) |
|---|---|---|---|
| ST-Link V2 | Firmware programmer through SWD-port | AliExpress, Amazon | 800β1500 β½ |
| USB-A cable β USB-C | For PC connection (for official firmware only) | Any electronics store | 200β500 β½ |
| Firmware file (.bin) | Official or custom firmware | Xiaomi EU Forum, 4PDA | Free of charge. |
| Programme STM32CubeProgrammer | Utility for recording firmware through ST-Link | Official website of STMicroelectronics | Free of charge. |
| Screwdriver. T8/T10 | For disassembling the scooter body | Tools store | 100β300 β½ |
For official firmware (for example, updates via Mi Home) is enough USB-cable and smartphone, but if you plan to install custom firmware (for example, DRV Note that cheap Chinese ST-Links often have driver problems β itβs better to buy original or proven clones with a chip. STM32F103C8T6.
Where to look for firmware:
- π Official β on the Xiaomi website in the support section (registration is required)
- π§ Castomium - in forums 4PDA (theme M365 Pro 2") or in Telegram channels like @ScooterHacking
- π Archival versions on GitHub (e.g. repository) m365-firmware)
Preparation of the scooter for firmware: disassembly and connection
Before the firmware, you have to physically prepare the scooter, which is often overlooked, but this is where most errors are made.
- Disconnect the scooter from charging and wait 10-15 minutes - this is necessary to discharge the capacitors in the controller.
- Turn over the scooter and remove the bottom cover, unscrewing 4 screws T8 (They're angled).
- Carefully disconnect the battery connector from the controller β it is usually black with a red lock.
- Find it. SWD-port on the controller board (4 contacts: GND, SWDIO, SWCLK, 3.3V).
To connect ST-Link, use the following link:
ST-Link β Controller M365 Pro 2
ββββββββββΌβββββββββββββββββββββββ
GND β GND (black wire)
SWDIO β SWDIO (white/yellow)
SWCLK β SWCLK (green)
3.3V β 3.3V (red)Important: Don't plug in 5V From ST-Link to controller -- it can burn the board! Use only 3.3V. If you are not sure about the slinging, check it with a multimeter in vertebrae mode.
βοΈ Pre-firmware check
β οΈ Warning: If the controller starts to warm or smell like a burn after connecting the ST-Link, turn off the power immediately! This is a sign of a short circuit, often caused by improperly pinching.
Step-by-step: Firmware through STM32CubeProgrammer
This method is suitable for installing custom firmware (for example, DRV For official updates, use Mi Home or Xiaomi Scooter App. The instructions below are relevant for Windows. 10/11:
- Install. STM32CubeProgrammer and drivers for ST-Link.
- Connect ST-Link to your PC and scooter (as described in the previous section).
- Launch it. STM32CubeProgrammer, Select ST-Link from the Connector menu.
- Press Connect β if everything is connected correctly, the program will show the controller model (usually the same as the one you use). STM32F103x).
- Go to the Erasing & Programming tab, select the firmware file (.bin) and click Start Programming.
It'll take 2-5 minutes.
- Turn off the ST-Link.
- Connect the battery back to the controller.
- Turn on the scooter with the power button.
If the scooter is not operated:
- π Check the battery connection - the connector should click when fixing.
- π Try charging the scooter for 10-15 minutes, then turn it on again.
- π» Reflash the controller with the original firmware (if there is a backup).
What if the ST-Link does not define the controller?
Official Update via Mi Home: A Safe Method
If you are satisfied with factory restrictions, but you need to fix bugs or improve stability, use the official software through the Mi Home application. This method does not require disassembling the scooter and retains the warranty.
- Install Mi Home (Android/iOS) log in.
- Connect the scooter to the application via Bluetooth (press the power button for 5 seconds to enable pairing mode).
- Go to Device Profile β Settings β Firmware Update.
- If a new version is available, click Update and wait until it is completed (the scooter will reboot automatically).
Advantages of the official method:
- β Xiaomi Guarantee Remains Guarantee.
- β No risk of bricking".
- β Automatic compatibility check.
Disadvantages:
- β Speed limit to 20-25 km/h.
- β No access to advanced settings (e.g., settings) KERS).
- β Updates come out less often than custom firmware.
π‘
Xiaomiβs official firmware often blocks the possibility of rollback to an older version. If bugs appear after the update, it will be difficult to return the old software.
Common mistakes and their solutions
Even with the correct following of the instructions, problems can arise, and here are the most common mistakes and ways to correct them:
| Mistake. | Reason. | Decision |
|---|---|---|
| ST-Link does not see the controller | Incorrect slinging, lack of nutrition | Check the connection. 3.3V and GND, Try another ST-Link. |
| Verify failed error | A damaged firmware file or unstable connection | Download the firmware again, check it out. MD5-hash, use it. USB-feed-in |
| The scooter does not turn on after firmware | Incompatible firmware or recording failure | Try flashing the original software, check the battery connection |
| The Mi Home app is not connected | Castom firmware blocks Bluetooth | Use alternative applications (ScooterHacking Utility) |
| The scooter twitches when moving | Wrong settings PID-firmware | Reverse to factory firmware or set up PID through DRV Tool |
If the scooter behaves unstable after firmware (for example, arbitrarily brakes or loses power), the problem is likely to be incorrect controller settings.
- Reset the settings to factory (press the power button for 10 seconds).
- Check the firmware compatibility with your version of the controller (you can find it through the STM32CubeProgrammer).
- If the problem remains, go through the original software and contact the service.
π‘
Before the firmware, take a picture of the sticker on the controller β it shows the exact model of the chip (for example, the chip is displayed, STM32F103C8T6). This information will be useful when choosing a firmware.
How to Get Back the Original Firmware
If custom firmware was unstable or you want to return the warranty, you can roll back to the factory software.
- Download the original firmware for your version M365 Pro 2 (for example, with Xiaomi) EU Forum).
- Connect the ST-Link and start it. STM32CubeProgrammer.
- In the Erasing & Programming tab, select the Full chip erase option before the firmware.
- Download the original.bin file and wait until it is completed.
After the rollback:
- The scooter will return to factory settings (including speed limit).
- Communication with Mi Home will be restored (if there were no hardware changes).
- Warranty stickers will remain intact (unless you damaged them in disassembly).
Important: Some custom firmware blocks the rollback option by changing the bootloader, which requires:
- Use it. JTAG unlockable.
- Refer to a specialized service (cost) ~2000β3000 β½).
β οΈ Warning: If the scooter doesn't turn on after rolling back, but ST-Link sees it, there's a problem with the damaged bootloader, and you can only recover it with the original memory dump from the same working controller.