Hi,
I want to install the previous Ardusub firmware. I clicked advanced settings to choose the custom firmware option. Although I downloaded the previous firmware file to my pc, it says that there is no firmware.
What should I do?
Are you sure you downloaded the correct file?
You can find the correct files here :
https://www.ardusub.com/resources/downloads.html#raspberry-pi-images
or
https://firmware.ardupilot.org/Sub/
if you have pixhawk1 you must download https://firmware.ardupilot.org/Sub/stable/Pixhawk1/ardusub.apj (apj file)
if you have pixhawk4 you can download px4 files
https://firmware.ardupilot.org/Sub/
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