> For the complete documentation index, see [llms.txt](https://guide.cronuszen.com/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://guide.cronuszen.com/frequently-asked-questions/error-300x-e3-e3001-e3002.md).

# Error 300X (E3 / E3001 / E3002)

#### Question:

***

What do E3, E3001, or E3002 errors mean?

#### Answer:

***

These error codes indicate firmware corruption or a system crash.

They typically occur when:

• Firmware installation was interrupted\
• The device lost power during an update\
• Firmware files became corrupted

#### How to Fix

Perform a **Factory Reset / Firmware Recovery**:

1. Enter **Bootloader Mode** (hold the blue reset button while connecting to PC).
2. Go to **firmware.modcentral.ca** using Chrome or Edge.
3. Reinstall the latest firmware.

If the update fails, connect both the **CONSOLE/PC** and **PROG** USB ports to ensure sufficient power.


---

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