Update to version 2.2 on my HTC Hero Android 1.5 phone Currently I am using HTC Hero with Android 1.5 and as we know right now Android 2.2 (Froyo) has been released, so i am planning to upgrade from 1.5 to 2.2.

Regarding updating, I have the following questions:


How do I update it?
Is there any selection options provided to update? For example I want to update my 1.5 to 2.1 instead of 2.2, 2.0 or anything else.
Are there any issues that have already occurred with Android 2.2?
What if I want to down-grade to lower version, is it possible? (i.e. rollback to older version)
Unfortunately, if you were running SDK 1.6 or later you could just update without installing a new SDK. But for 1.5 you need to install a new SDK. Per this link from Google http://developer.android.com/sdk/installing.html (see quoted text below)...

How ever, you can backup your projects and move them into the new SDK environment. So it looks like all may not be lost. Just read that link above pretty thoroughly.


  Updating?
  
  If you are currently using the Android
  1.6 SDK or later and want to update to the latest tools or platforms, you do
  not need to install a new SDK.
  Instead, you can simply update the
  individual components in your SDK
  using the Android SDK and AVD Manager
  tool. For information about how to do
  that, see Updating SDK Components
  
  If you are using Android 1.5 SDK or
  earlier, you should install a new SDK
  as described in this document and move
  your application projects to the new
  SDK environment.