I currently have a G1 with Android 1.6, build number kila-userdebug 1.6 DRD23C 17927 test-kyes and I am wondering what I can upgrade this to without rooting it. I would prefer to not risk bricking my phone. I am really just trying to install the newest Google Maps with Google Navigator but I keep getting an error message. Some posts that I have found imply that I should be able to install in on 1.6 and others say no, must be on 2.0, so I really don't know. I had another G1 that unfortunately no longer works and it had Google Navigator on it, although I never checked to see what the OS version was. Any thoughts? Thanks.