Segway G3 Max: VCU Modification (Speed Limits and Region Change)

⚠️ Warning

The scooter's warranty will be voided!
You perform these actions at your own risk. Possible consequences:

• VCU controller failure
• Unstable scooter performance

📋 Required Components

1. Hardware:

   • ST-Link v2 programmer
   • DUPON cables
   • Soldering iron (for TP13V3 contact)

2. Software:

   • [STLink Driver]
   • Modification Tool

🛠 Preparation

1. Install the driver (dpinst_amd64.exe)
2. Extract the software archive to a folder
3. Key files:
   • dump_memory.bat - memory dump tool
   • fix_vcu.exe - modification tool
   • flash_memory_patched.bat - firmware flash tool

🔌 ST-Link Connection

Before connecting, carefully check your ST-Link pinout as it may vary depending on your model.

Important! Disconnect the VCU from the scooter before starting.

No.	ST-Link	VCU
1	SWDIO	DIO
2	SWCLK	CLK
3	GND	GND
4	3.3V	TP13V3*
5	GND**	C45 (temporary)

*Soldering required (fragile contact!)
**Used only for shorting to C45

🔄 Modification Process

1. Creating a Dump

1. Short pin 5 (GND) to C45
2. Run dump_memory.bat
3. When the line oocd\scripts/mem_helper.tcl", line 37 appears, disconnect the contact
4. Verify the MEMORY_G3.bin file (128 KB) exists
5. download ANY hex editor, for example https://mh-nexus.de/en/hxd/
6. open hex editor, open your dump file MEMORY_G3.bin
7. press edit-> Goto (in other programms maybe go to offset)
8. enter 1F020 or 0x1F020
9. you should see your serial number two times, if not, your dump is !!!corrupted!!!! repeat again from start

2. Parameter Modification

Run fix_vcu.exe and enter:
Follow program instructions. To move scooter to another region yopu have to modify SN

Change region? (Y/N): Y

3. Flashing

1. Short GND to C45 again
2. Run flash_memory_patched.bat
3. Disconnect when oocd\scripts/mem_helper.tcl", line 37 appears
4. The transfer is complete when the console shows:
   wrote 131072 bytes from file MEMORY_G3.bin.patched.bin to flash bank 0 at offset 0x00000000 in 3.471415s (36.873 KiB/s)

4. Post-Flash Setup

1. Unbind the scooter in the app
2. Reconnect the VCU to the scooter (disconnect STLink first)
3. Rebind and activate both toggles:
   

LICENSE

5. Final Step

Repeat steps 1-3 to activate changes.
Important! Do not touch the sliders afterward!

❌ Possible Errors

• open failed → Check STLink connection to PC

• init mode failed → VCU connection error (check contacts)

• if you got error that your SN already binded to other account:

  1. run change_sn_windows_amd64.exe
  2. chose your file MEMORY_G3.bin.patched.bin
  3. enter new SN, template 1CGCC++++C++++ where + is any number
  4. it will create file with name MEMORY_G3.bin.patched.bin.sn_changed.bin
  5. rename it to MEMORY_G3.bin.patched.bin
  6. FLASH it again