I'm having a problem with my Garmin instinct solar. I haven't been able to use the pulse oximeter and the hr monitor. The software version of the watch is 18.11 (74b8247). And sometimes it crashed when I use it. The sensor in the back lights up but didn't do anything. I think it's software related. Is it possible to downgrade the software version? I've tried to downgrade it by downloading 17.50 software version. And copy-paste it into the garmin forlde. But it doesn't do anything to the watch.