o ok, I see. Please read the info in the New ElectraOne console / Testing needed.
The firmware up to and including 1.5 is using the .frm format (larger in size). The beta branch of the firmware is preparing a switch onto different way of loading the firmware. Hence, the .img file. The .img file is a true binary image for the target processor in Electra and it is smaller than original files.
The main thing is that the .frm files can be uploaded with the official ElectraOne console. If you want to load the .img file you need to use the beta of the ElectraOne console:
In other words, beta firmware (1.5.7) must be flashed with the beta version of the ElectraOne console.
the steps to update to the beta:
- Install the beta ElectraOne console
- Download 1.5.7 firmware, ie. the .img file
- Connect Electra controller to USB port
- Start the beta ElectraOne console
- Click the update button on the back panel
- Use the beta ElectraOne console to load the .img firmware to the controller
I hope it helps. If not, let me know.