There is a beta v68 firmware, but not sure if it would be better than your latest release version, which is the current stable version.
The manual update section is here:
https://manuals.sharkrf.com/openspot3/en/troubleshooting.html#page-top
scroll down until you see "I want to manually update the firmware".
However, you probably should follow the section above it, titled "The openSPOT3 won't turn on"
Follow the steps and see if that gets it working.