Electric vehicle owners often face the need to update the controller software to fix bugs, improve stability or unlock hidden functionality. The Xiaomi M365 Pro is a popular model that over time requires attention to its software to work correctly in various weather conditions and load modes. The firmware process can seem difficult to a beginner, but with a clear algorithm of actions it becomes quite feasible at home.
Before you start manipulating code, it is important to understand that any interference with the electronic control unit carries certain risks. Incorrectly selected version of the software or interruption of the data recording process can cause the device to fail, turning it into a so-called “brick”. However, knowing the technical nuances and having the necessary tools at hand, you can safely conduct the procedure and enjoy improved driving dynamics.
In this article, we will take a look at all the steps in preparation, tool selection and the immediate process of flashing, how official firmware differs from modified firmware, what cables will be required to connect and how to act in case of critical errors, the main thing is to keep your cool and read each paragraph of the instructions carefully before executing it.
⚠️ Note: All flashing actions are performed at your own risk, and the manufacturer may refuse warranty service if traces of third-party interference with the code are detected.
Preparation of equipment and choice of firmware
The first step is to carefully prepare the workplace and choose the right software. For the Xiaomi M365 Pro, there are various versions of firmware, including official stock firmware and modified builds from enthusiasts that allow you to remove speed limits or change the logic of recovery. It is important to choose the version that matches your hardware revision of the scooter, as incompatibility of the controller and battery versions can lead to locking the device.
To connect to the scooter, you'll need a special adapter cable, often called a "peaker" or USB-to-UART adapter. A standard charging cable won't work here, because it only transmits power, but not data. You also need a Windows computer that has drivers installed to work with a serial port. Without the right driver, the computer simply won't see the connected controller.
Make sure the battery is at least 80% charged, the firmware process is energy intensive, and if the charge falls below the critical mark during data recording, the controller may not start later. Check the integrity of the contacts on the charging port, as poor contact can cause a data transmission interruption at the most inopportune time.
- 🔌 USB-to-UART (ST-Link or specialized for Xiaomi).
- 💻 Laptop or PC with Windows and installed drivers CH340 or ST-Link.
- 📂 Firmware file (.bin or.exe depending on the method).
- 🔧 Screwdriver to remove the protective cover of the deck (if direct access is required).
Download firmware files only from trusted sources, such as official forums or open source repositories. Using files from questionable publics can lead to malicious code installation or damage to the controller's file system structure. Keep a backup of the current firmware if the software used allows you to backup before recording.
Installation of drivers and connection to the PC
After the files are prepared, you need to set up the software environment. M365 Pro, drivers are required for virtual COM-If you're using a chip-based adapter. CH340, Download and install the driver from the official website of the chip manufacturer. Windows Device Manager should have a new port, such as USB-Serial, after connecting the cable. CH340 (COM3).
Connecting the scooter to the computer is through the charging port or by direct contact with the contact platform inside the deck, depending on the type of adapter. When using an external adapter ("Peter"), you need to turn on the scooter, and then connect the cable to the PC. Indicators on the adapter should light up, signaling the presence of power and connection.
If your computer is not responding to the connection, try changing the connection. USB-port, it is desirable to use the ports. USB 2.0 on the back of the system unit, as they provide more stability!
In some cases, you may need to manually install a hardware ID. Open Device Manager, find an unknown device, right-click, and select "Update Driver." Specify the path to the folder with the drivers loaded. Successful driver installation is the foundation without which further action is impossible, so pay special attention to this step.
It's worth noting that direct firmware through BMS contacts may require opening the deck, which disrupts the water protection, so once you're done, you need to carefully treat the joints with a sealant. Don't ignore the precautions when dealing with the high-voltage electrical circuits that are present inside the battery compartment.
The Firmware Process Through XiaomiFlasher
One of the most reliable ways to update is to use specialized software such as XiaomiFlasher or its analogues, which allows you to download binary files (.bin) directly to the controller memory, bypassing the limitations of the official application.
In the program interface, select the appropriate COM-The port you identified earlier in Device Manager: Download the firmware file by pressing the "Choose" or "Load" button. Before starting the process, make sure the scooter is on and the battery indicator is on. Press the "Flash" or "Start" button and wait for the process to be completed. At this time, indicators on the scooter can flash in a chaotic order - this is a normal phenomenon, indicating the recording of data.
The process takes 30 seconds to 2 minutes depending on the amount of data being updated and the speed of the interface. Power interruption or cable disconnection at this point is fatal. If the progress bar is frozen at a certain percentage and does not move for more than 5 minutes, it may be that the firmware file is damaged or incompatible with the BMS version of the controller.
- 🚀 Start the firmware program on behalf of the administrator.
- 🔍 Choose the right one. COM-drop-down.
- 📂 Specify the path to the firmware file (.bin).
- ⚡ Press the launch button and do not touch the cable until the success message appears.
Once successful, the software will have a message, "Flash Done" or something similar, and the scooter can reboot itself or make an audible beep. Turn off the cable and try to turn on the scooter with the power button. If it's turned on and displays the correct charge level, the procedure was successful.
Restoration of the “brick” and debugging of BMS
If the scooter doesn’t turn on after firmware, the indicators don’t burn, or there is a strange behavior (blinking of all diodes), most likely, the controller went into protective mode or the loader was damaged, in which case a recovery procedure, often called “revival”, will be required. The Xiaomi M365 Pro is characterized by the ability to flash flash even when “dead” if the loader is intact.
Sometimes you need to close the contacts on the BMS board to put the controller in programming mode. The battery board has special contacts, often marked as T (Test) or P (Program), short-circuiting these contacts with the connected charger can activate recovery mode. However, you need to do this extremely carefully so as not to cause a short circuit.
⚠️ Attention: Close contacts on the board BMS If you don't understand the circuitry, you can fire a lithium battery, and you can only do it if you're confident in your actions and you have a multimeter.
For deep debugging, a protocol is used UART. Connecting to contacts TX, RX and GND On the controller board, you can see real-time download logs through a terminal (such as PuTTY or SecureCRT) to see the exact error that prevents the system from starting.
If software methods don't work, there may be a problem with the hardware. Check the fuse on the BMS board that might have burned when the voltage spikes. It's also worth checking the voltage at the main contacts of the battery - if it falls below the permissible minimum, the controller can block the start for safety reasons.
Comparison of software update methods
There are several ways to update your scooter software, and each has its own advantages and disadvantages, and the choice of method depends on your goals: whether you just want to get an official update or plan to tune.
| Method | Difficulty | Risks. | Functional |
|---|---|---|---|
| Official appendix (Mi Home) | Low. | Minimum | Official versions only |
| XiaomiFlasher (via port) | Medium | Average. | Any version of.bin |
| Direct soldering (ST-Link) | Tall. | Tall. | Complete control of iron |
The official Bluetooth method is convenient for the average user, but it will not allow you to roll back on the old version or install custom firmware. The method using cable and PC gives more freedom, but requires the availability of equipment. Direct soldering to contacts on the board is the lot of professionals and repairmen, because it requires opening the case and soldering skills.
Custom firmware, such as Custom Firmware, often allows you to unlock speeds of up to 35-40 km/h, change the recovery algorithm and adjust the backlight. However, they can work unstablely with the original BMS, causing false alarms.
Frequent mistakes and their solution
When firmware Xiaomi M365 Pro users often encounter typical problems, and one of the most common is a Connection Failed or connection timeout error, which usually means that the driver is installed incorrectly, the wrong driver is selected. COM-port or cable is damaged. USB-cable or connect it to another port.
Another common problem is Checksum Error, which occurs when the firmware file is not fully downloaded or corrupted when it is downloaded; always check the integrity of the files by comparing the hash amount to the originals if possible; and an error may occur if the bootloader version does not match the firmware version.
If the scooter is running after firmware but doesn't show speed or battery power, it's possible that the data protocol has been changed in the new version of the software and the app on the phone hasn't updated. Try reinstalling the app or using alternative clients like M365 Tools or Xiaoyi.
- ❌ Communication Error: Check the drivers and integrity of the cable.
- ❌ Recording error: Make sure the battery is charged and the scooter is on.
- ❌ Unstable work: Do a reset or return the stock firmware.
In rare cases, the problem may lie in the controller itself, which has failed physically. If none of the software methods work, and the indicators behave chaoticly even on the stock firmware, you may need to replace the electronic unit.