| Error Code / Symptom | Likely Cause | Solution | | :--- | :--- | :--- | | | HDD not recognized or corrupt format | Use SST to repartition and format the HDD (Service Mode > SST > HDD Format). | | “Timeout – No ACK” | USB cable too long or poor connection | Use a high-quality, shielded USB cable (under 3 meters). Reboot PC and device. | | “Invalid Firmware File” | Firmware mismatch or corrupted download | Re-download from a verified source. Check that the file is for the exact sub-model (e.g., C3330i vs C3325i). | | SST Crashes on Startup | Corrupted registry or driver conflict | Uninstall SST, run CCleaner (or similar), reinstall with AV disabled. | | Device Not Found | Wrong USB port used | Use the service port . On many models, you must remove a small screw cover. |

The is a diagnostic and firmware flashing utility designed for authorized Canon service technicians. Version 4.75 EP (Endurance Platform) specifically targets support for Canon’s enterprise and production printing systems, including imageRUNNER ADVANCE, imagePRESS, and large-format devices.

To download and install the Canon Service Support Tool V4.75 EP, follow these steps:

It helps format and prepare new Hard Disk Drives for use within the printer.