How to Fix Xiaomi Error 21

1. Step 1 of 4

   Preparation & Safety Check

   Set the vehicle on a stand and turn off all power systems. Gather the required tools: Hex Screwdriver Set, Soldering Iron.

   Schematic FIG. 1DIYPEV Technical Lab

   Electric micromobility vehicle stabilized on a mechanical work standReference Blueprint Schematic

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2. Step 2 of 4

   Disassembly & Part Access

   Access the target component by removing protective housings or screws. Take photos of wire connections to ensure correct re-routing.

   Schematic FIG. 2DIYPEV Technical Lab

   Removing protective covers from vehicle componentsReference Blueprint Schematic

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3. Step 3 of 4

   Installation or Alignment

   Fit the replacement part or adjust alignment. Check for proper positioning and secure connections.

   Schematic FIG. 3DIYPEV Technical Lab

   Installing the replacement hardware on the frame or handleReference Blueprint Schematic

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4. Step 4 of 4

   System Verification

   Re-mount protective covers, reconnect power cables, power on the system, and perform a stationary functional test.

   Schematic FIG. 4DIYPEV Technical Lab

   Verifying dashboard display controls and lever mechanismsReference Blueprint Schematic

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Welcome to our troubleshooting and installation guide for "How to Fix Xiaomi Error 21". This guide is part of our comprehensive diypev.com micro-mobility knowledge base.

Overview and Basic Steps

To complete this repair successfully, you must ensure that your workspace is clean, well-lit, and that you have the required safety gear ready.

1. Secure your vehicle on a flat surface or mounting stand.
2. Power off the electrical system and detach the main battery plug.
3. Follow assembly or disassembly procedures in sequence to avoid losing small parts.
4. Ensure all fasteners are tightened securely to specified torque guidelines.
5. Perform a stationary pre-check of the brakes and throttle before riding.