E20
Garo
Firmware Integrity / Bootloader Fault
E20 error; charger indicates firmware or software integrity problem.
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Safety Warning
This repair may involve working with high voltage components or water connections. Always unplug the appliance before removing any panels.
If you are not confident in your ability to perform this repair safely, we strongly recommend contacting a professional technician.
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Possible Causes
Interrupted firmware update, Corrupted firmware image, Faulty flash memory on main board
How to Fix / Troubleshooting
Safety first: Do not cycle power repeatedly during firmware operations.
- Attempt recovery: Use the Garo service tool or app to initiate a firmware recovery or re‑flash procedure, following Garo's official instructions.
- Stable power: Ensure the charger remains powered and network‑connected (if required) for the entire update process.
- Do not downgrade arbitrarily: Only use firmware versions approved for your exact Garo model.
- Board replacement: If the bootloader or flash memory is damaged and recovery fails, the main control board must be replaced.
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Repair Difficulty
Hard
4/5
Required Part
Main Control Board (Flash Memory / MCU)
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