My friend has bought a second hand Garmin Monterra. After several months the device stopped to communicate with PC. And there is a problem with the rechargeable battery . In the begginning it was OK, but the charging time has been longer and longer. And now there is no charging at all. I successfully repaired another Garmin navi with GarminCure 3 software, but Monterra is powered by Android. So how to fix the problem? Is it possible to load the OS from a memory card?