Comment 28 for bug 1568889

well I for one did once enable r/w and installed packages (don't think it was much more than pastebinit) however around OTA9 I reflashed the device destroying data and returning to factory, when through the startup wizard and everything and I have not enable r/w since then, and my phone won't install OTA11. So, either it does happen for people who haven't enabled r/w or the process of reflashing over adb doesn't actually clear out all the stuff it was supposed to do.