What do the error codes mean?

KO IItutorialguide
By ivan.codes·Updated Apr 2026·Official KO II Guide ↗

The EP-133 has several error codes that indicate different types of issues.

Hardware Errors (Require Repair)

E.01 - SRAM Error The device's SRAM memory has failed and needs professional repair.

E.02 - Flash Error The flash memory has failed and needs professional repair.

E.03 - Codec Error The audio codec has failed and needs professional repair.

File System Errors (Can Be Fixed)

E.10 - LFS Invalid The file system is invalid. Format the flash drive to fix this.

E.11 - LFS Corrupt The file system is corrupted. Format the flash drive to fix this.

E.12 - Other LFS Error Another file system error occurred. Format the flash drive to fix this.

E.05 - Sample FS Error The sample file system has an error. Format the flash drive to fix this.

How to Format the Flash Drive

  1. 1.Hold SHIFT + ERASE while powering on the device.
  2. 2.The display shows "FMT" for about 10 seconds while formatting.
  3. 3.The device starts up with all content removed.
  4. 4.Update the firmware after formatting (visit teenage.engineering/apps/update).

Note: Formatting erases all your projects, scenes, patterns, and samples. The E.01, E.02, and E.03 errors cannot be fixed by formatting and require professional repair from Teenage Engineering.

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