Does anyone know how to fix this problem? I am on the latest firmware

Well the problem is that after I swam for 5 minutes in a pool my Garmin 245 started to act up. The heart rate monitor stopped working and the watch was buzzing in a strange way. This buzzing issue disappeared but the heart rate monitor is still not working. I did a Reset by keeping the light button pressed for 30 seconds and after the restart in the about section many fields appeared with version 0 which is not ok!
I was hoping that people from Garmin would guide me with a way to restore the firmware and fix these issues but it seems that there is total radio silence. Which is extremely disappointing to see...