735 Update file does not correspond or is too old - Incorrect software update file.

What does 735 mean?

A warning message appears on the display, and the update process is canceled because the update file on the USB stick is either not for this device or is too old.

• Downloaded the wrong update file.
• File is corrupted.
• File is incompatible with the inverter's current firmware version.

Click steps to track your progress.

1. 1

   Check the update file name and version to ensure it is specifically for your Fronius Primo model.

2. 2

   Download the correct and latest update file for your device from the official Fronius website (e.g., http://www.fronius.com).

3. 3

   Place the correct update file in the root directory of a freshly formatted USB stick and try the update process again. If the code persists, contact a Fronius-trained service technician.