I tried to update my Oregon 300 to 2.99 and everything worked fine untill I'm turning of my device. Have the same issue when screen turns half black and half white. I contacted to Garmin support and they confirmed that this is bug. Then I decided to downgrade to 2.98 that previously worked fine. Everything was OK untill I deisconnected device from laptop un turned it ON. During software validation process the device turned off. Then I was unable to start it again and also it doesn't connect to computer anymore - device turn on and after several seconds just turs off. The result is that I brought my device to local Garmin dealer and after couple of days they exchenge my device to brand new. They confirmed that somehow the main system is toatlly broked down. If anyone hasn't tried new 2.99 version yet, then don't even try.