What does E.05 mean on EP-133 KO II?

E.05 indicates "Sample Filesystem Error". File-system error. The flash storage needs to be formatted. This will erase all your samples and patterns, but factory content will remain. To fix this, Power the device off, then hold [COMMIT] + [SOUND] and turn it on. FMT will display on the screen for about 10 seconds, then it will start up as usual with all user content removed.

What does E.10 mean on EP-133 KO II?

E.10 indicates "LFS Invalid". File-system error. The internal file system is invalid and needs to be formatted. This will erase all your samples and patterns. To fix this, Power the device off, then hold [COMMIT] + [SOUND] and turn it on. FMT will display on the screen for about 10 seconds, then it will start up as usual with all user content removed.

What does E.11 mean on EP-133 KO II?

E.11 indicates "LFS Corrupt". File-system error. The internal file system is corrupted and needs to be formatted. This will erase all your samples and patterns. To fix this, Power the device off, then hold [COMMIT] + [SOUND] and turn it on. FMT will display on the screen for about 10 seconds, then it will start up as usual with all user content removed.

What does E.12 mean on EP-133 KO II?

E.12 indicates "Other LFS Error". File-system error. There's an issue with the internal file system that requires formatting. This will erase all your samples and patterns. To fix this, Power the device off, then hold [COMMIT] + [SOUND] and turn it on. FMT will display on the screen for about 10 seconds, then it will start up as usual with all user content removed.

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EP-133 KO II Error Codes

Q: What does E.01 mean on EP-133 KO II?

E.01 indicates "SRAM Error". This is a hardware error. Your unit needs to be repaired by Teenage Engineering. Contact their support for repair options.

Q: What does E.02 mean on EP-133 KO II?

E.02 indicates "Flash Error". This is a hardware error. Your unit needs to be repaired by Teenage Engineering. Contact their support for repair options.

Q: What does E.03 mean on EP-133 KO II?

E.03 indicates "Codec Error". This is a hardware error. Your unit needs to be repaired by Teenage Engineering. Contact their support for repair options.

Troubleshooting guide for all EP-133 KO II error codes

Quick Reference

Code	Meaning	Type
E.01	SRAM Error	Hardware
E.02	Flash Error	Hardware
E.03	Codec Error	Hardware
E.05	Sample Filesystem Error	Fixable
E.10	LFS Invalid	Fixable
E.11	LFS Corrupt	Fixable
E.12	Other LFS Error	Fixable

Fixable Errors (File System)

These errors can be fixed by formatting the flash storage. Warning: This will erase all your samples and patterns, but factory content will remain.

E.05

Sample Filesystem Error

File-system error. The flash storage needs to be formatted. This will erase all your samples and patterns, but factory content will remain.

To fix: Power the device off, then hold [COMMIT] + [SOUND] and turn it on. FMT will display on the screen for about 10 seconds, then it will start up as usual with all user content removed.

E.10

LFS Invalid

File-system error. The internal file system is invalid and needs to be formatted. This will erase all your samples and patterns.

To fix: Power the device off, then hold [COMMIT] + [SOUND] and turn it on. FMT will display on the screen for about 10 seconds, then it will start up as usual with all user content removed.

E.11

LFS Corrupt

File-system error. The internal file system is corrupted and needs to be formatted. This will erase all your samples and patterns.

To fix: Power the device off, then hold [COMMIT] + [SOUND] and turn it on. FMT will display on the screen for about 10 seconds, then it will start up as usual with all user content removed.

E.12

Other LFS Error

File-system error. There's an issue with the internal file system that requires formatting. This will erase all your samples and patterns.

To fix: Power the device off, then hold [COMMIT] + [SOUND] and turn it on. FMT will display on the screen for about 10 seconds, then it will start up as usual with all user content removed.

How to Format Flash Storage

Power off your EP-133 KO II completely
Hold down [COMMIT] + [SOUND]
While holding, turn on the device
Wait for "FMT" to appear on screen (~10 seconds)
Device will restart with a fresh file system

Tip: After formatting, update to the latest OS version to prevent future issues.

Hardware Errors (Requires Repair)

These errors indicate a hardware problem that cannot be fixed by the user. Your device will need to be repaired by Teenage Engineering.

E.01

SRAM Error

This is a hardware error. Your unit needs to be repaired by Teenage Engineering. Contact their support for repair options.

E.02

Flash Error

This is a hardware error. Your unit needs to be repaired by Teenage Engineering. Contact their support for repair options.

E.03

Codec Error

This is a hardware error. Your unit needs to be repaired by Teenage Engineering. Contact their support for repair options.

Contact Teenage Engineering Support

If you're seeing a hardware error code, you'll need to contact Teenage Engineering for repair options:

Contact Support →

Prevention Tips

•Keep firmware updated: Install the latest OS updates to fix bugs that may cause file system errors.
•Use quality batteries: Low battery during write operations can corrupt the file system.
•Avoid power interruptions: Don't remove batteries or disconnect power while the device is saving.
•Back up your work: Regularly export your projects to avoid losing work if you need to format.

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