A little confusion here it seems and I will throw out my understanding. An ota will work if it does not have to access an officially signed recovery, if it does and does not find one it will fail. Once you have installed a custom recovery going back to the stock one will not help in this regard because it is no longer officially signed. 2.2 will require an officially signed recovery to install and everything I read says it will be seen, it will download, then it will fail to install. If this is incorrect than I look forward to learning more about this question as it keeps popping up over and over. I have yet to hear from any owner who was able to update from 2.0 to 2.1 after having installed a custom recovery, seems like there would have been many....